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90-825: The district is located within the Blue Ridge upland region, and is bounded on the eastern edge by the Blue Ridge Front. The pegmatites intruded into the Ashe Formation . The pegmatites and country rock are part of the Spruce Pine thrust block, the highest thrust sheet of the Blue Ridge belt , the latter being part of the Tugaloo Terrane which was accreted to North America during the Taconic Orogeny . A more refined age for

180-511: A diagonal relationship with magnesium , an element of similar atomic and ionic radius . Chemical resemblances between the two metals include the formation of a nitride by reaction with N 2 , the formation of an oxide ( Li 2 O ) and peroxide ( Li 2 O 2 ) when burnt in O 2 , salts with similar solubilities , and thermal instability of the carbonates and nitrides. The metal reacts with hydrogen gas at high temperatures to produce lithium hydride (LiH). Lithium forms

270-559: A pegmatitic gabbro ) is a coarse-grained rock containing patches of much coarser-grained rock of essentially the same composition. Individual crystals in pegmatites can be enormous in size. It is likely that the largest crystals ever found were feldspar crystals in pegmatites from Karelia with masses of thousands of tons. Quartz crystals with masses measured in thousands of pounds and micas over 10 meters (33 ft) across and 4 meters (13 ft) thick have been found. Spodumene crystals over 12 meters (40 ft) long have been found in

360-404: A rhombohedral crystal system (with a nine-layer repeat spacing); at higher temperatures it transforms to face-centered cubic and then body-centered cubic . At liquid-helium temperatures (4 K) the rhombohedral structure is prevalent. Multiple allotropic forms have been identified for lithium at high pressures. Lithium has a mass specific heat capacity of 3.58 kilojoules per kilogram-kelvin,

450-412: A composition similar to granite , so that their most common minerals are quartz , feldspar , and mica . However, other pegmatite compositions are known, including compositions similar to nepheline syenite or gabbro . The term pegmatite is thus purely a textural description. Geologists typically prefix the term with a compositional description, so that granitic pegmatite is a pegmatite with

540-439: A dull silvery gray, then black tarnish. It does not occur freely in nature, but occurs mainly as pegmatitic minerals, which were once the main source of lithium. Due to its solubility as an ion, it is present in ocean water and is commonly obtained from brines . Lithium metal is isolated electrolytically from a mixture of lithium chloride and potassium chloride . The nucleus of the lithium atom verges on instability, since

630-589: A fairly large number of both lithium mineral and brine deposits but only comparatively few of them are of actual or potential commercial value. Many are very small, others are too low in grade." Chile is estimated (2020) to have the largest reserves by far (9.2 million tonnes), and Australia the highest annual production (40,000 tonnes). One of the largest reserve bases of lithium is in the Salar de Uyuni area of Bolivia, which has 5.4 million tonnes. Other major suppliers include Australia, Argentina and China. As of 2015,

720-450: A few pegmatites have a complex composition, with numerous unusual minerals of rare elements. These complex pegmatites are mined for lithium , beryllium , boron , fluorine , tin , tantalum , niobium , rare earth elements , uranium , and other valuable commodities. The word pegmatite derives from Homeric Greek , πήγνυμι ( pēgnymi ), which means “to bind together”, in reference to the intertwined crystals of quartz and feldspar in

810-407: A flame, lithium compounds give off a striking crimson color, but when the metal burns strongly, the flame becomes a brilliant silver. Lithium will ignite and burn in oxygen when exposed to water or water vapor. In moist air, lithium rapidly tarnishes to form a black coating of lithium hydroxide (LiOH and LiOH·H 2 O), lithium nitride (Li 3 N) and lithium carbonate (Li 2 CO 3 , the result of

900-611: A higher aluminium content (peraluminous granites). Intermediate pegmatites (NYF + LCT pegmatites) are known and may have formed by contamination of an initially NYF magma body with melted undepleted supracrustral rock. Pegmatites often contain rare elements and gemstones . Examples include aquamarine , tourmaline, topaz, fluorite, apatite, and corundum , often along with tin , rare earth, and tungsten minerals, among others. Pegmatites have been mined for both quartz and feldspar. For quartz mining, pegmatites with central quartz masses have been of particular interest. Pegmatites are

990-522: A higher than usual concentration of lithium (such as Centaurus X-4 ) orbit massive objects—neutron stars or black holes—whose gravity evidently pulls heavier lithium to the surface of a hydrogen-helium star, causing more lithium to be observed. On 27 May 2020, astronomers reported that classical nova explosions are galactic producers of lithium-7. Although lithium is widely distributed on Earth, it does not naturally occur in elemental form due to its high reactivity. The total lithium content of seawater

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1080-749: A larger intrusion. Pegmatites in low-grade metamorphic rock tend to be dominated by quartz and carbonate minerals . Pegmatites in metamorphic rock of higher grade are dominted by alkali feldspar . Gabbroic pegmatites typically occur as lenses within bodies of gabbro or diabase . Nepheline syenite pegmatites are common in alkaline igneous complexes. Volcanic rocks : Subvolcanic rocks : Plutonic rocks : Picrite basalt Peridotite Basalt Diabase (Dolerite) Gabbro Andesite Microdiorite Diorite Dacite Microgranodiorite Granodiorite Rhyolite Microgranite Granite Lithium Lithium (from Ancient Greek λίθος ( líthos )  'stone')

1170-641: A major source of artificial lithium fractionation, with the light isotope Li being retained by industry and military stockpiles to such an extent that it has caused slight but measurable change in the Li to Li ratios in natural sources, such as rivers. This has led to unusual uncertainty in the standardized atomic weight of lithium, since this quantity depends on the natural abundance ratios of these naturally-occurring stable lithium isotopes, as they are available in commercial lithium mineral sources. Both stable isotopes of lithium can be laser cooled and were used to produce

1260-449: A rate ranging from 1 m to 10 m per day. Pegmatites are the last part of a magma body to crystallize. This final fluid fraction is enriched in volatile and trace elements. The residual magma undergoes phase separation into a melt phase and a hydrous fluid phase saturated with silica , alkalis , and other elements. Such phase separation requires formation from a wet magma, rich enough in water to saturate before more than two-thirds of

1350-421: A secondary reaction between LiOH and CO 2 ). Lithium is one of the few metals that react with nitrogen gas. Because of its reactivity with water, and especially nitrogen, lithium metal is usually stored in a hydrocarbon sealant, often petroleum jelly . Although the heavier alkali metals can be stored under mineral oil , lithium is not dense enough to fully submerge itself in these liquids. Lithium has

1440-1042: A simple composition, often being composed entirely of minerals common in granite, such as feldspar, mica, and quartz. The feldspar and quartz often show graphic texture . Rarely, pegmatites are extremely enriched in incompatible elements , such as lithium , caesium , beryllium , tin , niobium , zirconium , uranium , thorium , boron, phosphorus, and fluorine. These complex pegmatites contain unusual minerals of these elements, such as beryl, spodumene, lepidolite, amblygonite, topaz, apatite, fluorite, tourmaline, triphylite , columbite , monazite , and molybdenite . Some of these can be important ore minerals. Some gemstones , such as emerald , are found almost exclusively in pegmatites. Nepheline syenite pegmatites typically contain zirconium, titanium , and rare earth element minerals. Gabbroic pegmatites typically consist of exceptionally coarse interlocking pyroxene and plagioclase . Pegmatites are enriched in volatile and incompatible elements , consistent with their likely origin as

1530-485: A single valence electron that, in the presence of solvents, is easily released to form Li . Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals. Lithium's lower reactivity is due to the proximity of its valence electron to its nucleus (the remaining two electrons are in the 1s orbital , much lower in energy, and do not participate in chemical bonds). Molten lithium

1620-476: A solid mineral, as opposed to potassium, which had been discovered in plant ashes, and sodium, which was known partly for its high abundance in animal blood. He named the new element "lithium". Arfwedson later showed that this same element was present in the minerals spodumene and lepidolite . In 1818, Christian Gmelin was the first to observe that lithium salts give a bright red color to flame. However, both Arfwedson and Gmelin tried and failed to isolate

1710-489: A variety of binary and ternary materials by direct reaction with the main group elements. These Zintl phases , although highly covalent, can be viewed as salts of polyatomic anions such as Si 4 , P 7 , and Te 5 . With graphite, lithium forms a variety of intercalation compounds . It dissolves in ammonia (and amines) to give [Li(NH 3 ) 4 ] and the solvated electron . Lithium forms salt-like derivatives with all halides and pseudohalides. Some examples include

1800-427: A very low density (0.534 g/cm ), comparable with pine wood . It is the least dense of all elements that are solids at room temperature; the next lightest solid element (potassium, at 0.862 g/cm ) is more than 60% denser. Apart from helium and hydrogen , as a solid it is less dense than any other element as a liquid, being only two-thirds as dense as liquid nitrogen (0.808 g/cm ). Lithium can float on

1890-661: A wide variety of natural processes, including mineral formation (chemical precipitation), metabolism , and ion exchange . Lithium ions substitute for magnesium and iron in octahedral sites in clay minerals, where Li is preferred to Li, resulting in enrichment of the light isotope in processes of hyperfiltration and rock alteration. The exotic Li is known to exhibit a neutron halo , with 2 neutrons orbiting around its nucleus of 3 protons and 6 neutrons. The process known as laser isotope separation can be used to separate lithium isotopes, in particular Li from Li. Nuclear weapons manufacture and other nuclear physics applications are

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1980-518: Is Wise's (2022) pegmatite classification, which focuses mostly on the source of the magma from which the pegmatite crystalizes. Pegmatites form under conditions in which the rate of new crystal nucleation is much slower than the rate of crystal growth . Large crystals are favored. In normal igneous rocks, coarse texture is a result of slow cooling deep underground. It is not clear if pegmatite forms by slow or rapid cooling. In some studies, crystals in pegmatitic conditions have been recorded to grow at

2070-450: Is a chemical element ; it has symbol Li and atomic number  3. It is a soft, silvery-white alkali metal . Under standard conditions , it is the least dense metal and the least dense solid element. Like all alkali metals, lithium is highly reactive and flammable, and must be stored in vacuum, inert atmosphere, or inert liquid such as purified kerosene or mineral oil. It exhibits a metallic luster . It corrodes quickly in air to

2160-850: Is a chilled margin whose composition is representative of the original melt. Pegmatites derived from batholiths can be divided into a family of NYF pegmatites, characterized by progressive enrichment in niobium , yttrium , and fluorine as well as enrichment in beryllium, rare earth elements, scandium , titanium, zirconium, thorium, and uranium; and a family of LCT pegmatites, characterized by progressive accumulation of lithium, caesium , and tantalum, as well as enrichment in rubidium , beryllium, tin, barium, phosphorus, and fluorine. The NYF pegmatites likely fractionated from A- to I-type granites that were relatively low in aluminium (subaluminous to metaluminous granites). These granites originated from depleted crust or mantle rock. LCT pegmatites most likely formed from S-type granites or possibly I-type granites, with

2250-564: Is actually [BuLi] 6 and MeLi is actually [MeLi] 4 ) which feature multi-center bonding and increase the coordination number around lithium. These clusters are broken down into smaller or monomeric units in the presence of solvents like dimethoxyethane (DME) or ligands like tetramethylethylenediamine (TMEDA). As an exception to the duet rule, a two-coordinate lithate complex with four electrons around lithium, [Li(thf) 4 ] [((Me 3 Si) 3 C) 2 Li] , has been characterized crystallographically. Lithium production has greatly increased since

2340-478: Is also found in brown dwarf substellar objects and certain anomalous orange stars. Because lithium is present in cooler, less-massive brown dwarfs, but is destroyed in hotter red dwarf stars, its presence in the stars' spectra can be used in the "lithium test" to differentiate the two, as both are smaller than the Sun. Certain orange stars can also contain a high concentration of lithium. Those orange stars found to have

2430-655: Is an igneous rock showing a very coarse texture , with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz , feldspar , and mica , having a similar silicic composition to granite . However, rarer intermediate composition and mafic pegmatites are known. Many of the world's largest crystals are found within pegmatites. These include crystals of microcline , quartz , mica , spodumene , beryl , and tourmaline . Some individual crystals are over 10 m (33 ft) long. Most pegmatites are thought to form from

2520-437: Is apparently caused by the "mixing" of lithium into the interior of stars, where it is destroyed, while lithium is produced in younger stars. Although it transmutes into two atoms of helium due to collision with a proton at temperatures above 2.4 million degrees Celsius (most stars easily attain this temperature in their interiors), lithium is more abundant than computations would predict in later-generation stars. Lithium

2610-427: Is broad agreement on the basic mechanisms by which they form, the details of pegmatite formation remain enigmatic. Pegmatites have characteristics inconsistent with other igneous intrusions. They are not porphyritic , and show no chilled margin . On the contrary, the largest crystals are often found on the margins of the pegmatite body. While aplites are sometimes found on the margins, they are as likely to occur within

2700-665: Is credited with reintroducing and popularizing the use of lithium to treat mania in 1949. Shortly after, throughout the mid 20th century, lithium's mood stabilizing applicability for mania and depression took off in Europe and the United States. The production and use of lithium underwent several drastic changes in history. The first major application of lithium was in high-temperature lithium greases for aircraft engines and similar applications in World War II and shortly after. This use

2790-574: Is difficult. One reason for this is that most lithium classification schemes are developed for solid ore deposits, whereas brine is a fluid that is problematic to treat with the same classification scheme due to varying concentrations and pumping effects. In 2019, world production of lithium from spodumene was around 80,000t per annum, primarily from the Greenbushes pegmatite and from some Chinese and Chilean sources. The Talison mine in Greenbushes

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2880-467: Is followed by deposition of albite , lepidolite , gem tourmaline , beryl, spodumene, amblygonite , topaz , apatite , and fluorite , which may partially replace some of the minerals in the earlier zone. The center of the pegmatite may have cavities lined with spectacular gemstone crystals. Some pegmatites have more complex zoning. Five distinct zones are recognized in the Harding Pegmatite in

2970-427: Is found in trace amount in numerous plants, plankton, and invertebrates, at concentrations of 69 to 5,760 parts per billion (ppb). In vertebrates the concentration is slightly lower, and nearly all vertebrate tissue and body fluids contain lithium ranging from 21 to 763 ppb. Marine organisms tend to bioaccumulate lithium more than terrestrial organisms. Whether lithium has a physiological role in any of these organisms

3060-489: Is found. Pegmatites are found as irregular dikes , sills , or veins , and are most common at the margins of batholiths (great masses of intrusive igneous rock). Most are closely related spatially and genetically to large intrusions. They may take the form of veins or dikes in the intrusion itself, but more commonly, they extend into the surrounding country rock, especially above the intrusion. Some pegmatites surrounded by metamorphic rock have no obvious connection to

3150-586: Is known for producing multiple types of commercial materials. It holds the Earth's largest concentration of pure quartz. Ground micas are collected from the mining of other minerals in the district. Sheet mica also exists, but it is not mined. Feldspars are another major mineral that is mined here. Some companies that mine in the Spruce Pine district include: the Feldspar Corporation, Covia , K-T Feldspar, Sibelco Group and US Gypsum. Pegmatite A pegmatite

3240-475: Is not understood. Even the exact mechanisms involved in lithium toxicity are not fully understood. Petalite (LiAlSi 4 O 10 ) was discovered in 1800 by the Brazilian chemist and statesman José Bonifácio de Andrada e Silva in a mine on the island of Utö , Sweden. However, it was not until 1817 that Johan August Arfwedson , then working in the laboratory of the chemist Jöns Jakob Berzelius , detected

3330-460: Is on the order of magnitude of one to a few hundred meters. Compared to typical igneous rocks they are rather inhomogeneous and may show zones with different mineral assemblages. Crystal size and mineral assemblages are usually oriented parallel to the wall rock or even concentric for pegmatite lenses. Modern pegmatite classification schemes are strongly influenced by the depth-zone classification of granitic rocks published by Buddington (1959), and

3420-464: Is present in biological systems in trace amounts. It has no established metabolic function in humans. Lithium-based drugs are useful as a mood stabilizer and antidepressant in the treatment of mental illness such as bipolar disorder . The alkali metals are also called the lithium family, after its leading element. Like the other alkali metals (which are sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr)), lithium has

3510-424: Is significantly more reactive than its solid form. Lithium metal is soft enough to be cut with a knife. It is silvery-white. In air it oxidizes to lithium oxide . Its melting point of 180.50 °C (453.65 K; 356.90 °F) and its boiling point of 1,342 °C (1,615 K; 2,448 °F) are each the highest of all the alkali metals while its density of 0.534 g/cm is the lowest. Lithium has

3600-481: Is the only low numbered element that can produce net energy through nuclear fission . The two lithium nuclei have lower binding energies per nucleon than any other stable nuclides other than hydrogen-1 , deuterium and helium-3 . As a result of this, though very light in atomic weight, lithium is less common in the Solar System than 25 of the first 32 chemical elements. Seven radioisotopes have been characterized,

3690-684: Is unknown. Lithium concentrations in human tissue averages about 24 ppb (4 ppb in blood , and 1.3 ppm in bone ). Lithium is easily absorbed by plants and lithium concentration in plant tissue is typically around 1 ppm . Some plant families bioaccumulate more lithium than others. Dry weight lithium concentrations for members of the family Solanaceae (which includes potatoes and tomatoes ), for instance, can be as high as 30 ppm while this can be as low as 0.05 ppb for corn grains . Studies of lithium concentrations in mineral-rich soil give ranges between around 0.1 and 50−100 ppm , with some concentrations as high as 100−400 ppm, although it

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3780-766: Is unlikely that all of it is available for uptake by plants . Lithium accumulation does not appear to affect the essential nutrient composition of plants. Tolerance to lithium varies by plant species and typically parallels sodium tolerance ; maize and Rhodes grass , for example, are highly tolerant to lithium injury while avocado and soybean are very sensitive. Similarly, lithium at concentrations of 5 ppm reduces seed germination in some species (e.g. Asian rice and chickpea ) but not in others (e.g. barley and wheat ). Many of lithium's major biological effects can be explained by its competition with other ions. The monovalent lithium ion Li competes with other ions such as sodium (immediately below lithium on

3870-420: Is very large and is estimated as 230 billion tonnes, where the element exists at a relatively constant concentration of 0.14 to 0.25 parts per million (ppm), or 25 micromolar ; higher concentrations approaching 7 ppm are found near hydrothermal vents . Estimates for the Earth's crustal content range from 20 to 70 ppm by weight. In keeping with its name, lithium forms a minor part of igneous rocks , with

3960-512: The Black Hills of South Dakota , and beryl crystals 8.2 meters (27 ft) long and 1.8 meters (6 ft) in diameter have been found at Albany, Maine . The largest beryl crystal ever found was from Malakialina on Madagascar, weighing about 380 tons, with a length of 18 m (59 ft) and a crosscut of 3.5 m (11 ft). Pegmatite bodies are usually of minor size compared to typical intrusive rock bodies. Pegmatite body size

4050-821: The Czech Geological Survey considered the entire Ore Mountains in the Czech Republic as lithium province. Five deposits are registered, one near Cínovec  [ cs ] is considered as a potentially economical deposit, with 160 000 tonnes of lithium. In December 2019, Finnish mining company Keliber Oy reported its Rapasaari lithium deposit has estimated proven and probable ore reserves of 5.280 million tonnes. In June 2010, The New York Times reported that American geologists were conducting ground surveys on dry salt lakes in western Afghanistan believing that large deposits of lithium are located there. These estimates are "based principally on old data, which

4140-503: The Picuris Mountains of northern New Mexico , US. These are: Large crystals nucleate on the margins of pegmatites, becoming larger as they grow inward. These include very large conical alkali feldspar crystals. Aplites are commonly present. These may cut across the pegmatite, but also form zones or irregular patches around coarser material. The aplites are often layered, showing evidence of deformation. Xenoliths may be found in

4230-523: The coordination complex [Li(H 2 O) 4 ] predominates for many lithium salts. Related complexes are known with amines and ethers. Organolithium compounds are numerous and useful. They are defined by the presence of a bond between carbon and lithium. They serve as metal-stabilized carbanions , although their solution and solid-state structures are more complex than this simplistic view. Thus, these are extremely powerful bases and nucleophiles . They have also been applied in asymmetric synthesis in

4320-1087: The periodic table ), which like lithium is also a monovalent alkali metal . Lithium also competes with bivalent magnesium ions, whose ionic radius (86 pm ) is approximately that of the lithium ion (90 pm). Mechanisms that transport sodium across cellular membranes also transport lithium. For instance, sodium channels (both voltage-gated and epithelial ) are particularly major pathways of entry for lithium. Lithium ions can also permeate through ligand-gated ion channels as well as cross both nuclear and mitochondrial membranes . Like sodium, lithium can enter and partially block (although not permeate ) potassium channels and calcium channels . The biological effects of lithium are many and varied but its mechanisms of action are only partially understood. For instance, studies of lithium-treated patients with bipolar disorder show that, among many other effects, lithium partially reverses telomere shortening in these patients and also increases mitochondrial function, although how lithium produces these pharmacological effects

4410-459: The texture known as graphic granite . The term was first used by René Just Haüy in 1822 as a synonym for graphic granite . Wilhelm Karl Ritter von Haidinger first used the term in its present meaning in 1845. Pegmatites are exceptionally coarse-grained igneous rocks composed of interlocking crystals , with individual crystals usually over 1 centimeter (0.4 in) in size and sometimes exceeding 1 meter (3 ft). Most pegmatites have

4500-490: The Ginsburg & Rodionov (1960) and Ginsburg et al. (1979) classification which categorized pegmatites according to their depth of emplacement and relationship to metamorphism and granitic plutons. Cerny’s (1991) revision of that classification scheme is widely used, Cerny’s (1991) pegmatite classification, which is a combination of emplacement depth, metamorphic grade and minor element content, has provided significant insight into

4590-676: The Kibara Belt of Rwanda and Democratic Republic of the Congo , the Kenticha mine of Ethiopia the Alto Ligonha Province of Mozambique , and the Mibra (Volta) mine of Minas Gerais , Brazil. Notable pegmatite occurrences are found worldwide within the major cratons , and within greenschist -facies metamorphic belts. However, pegmatite localities are only well recorded when economic mineralisation

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4680-458: The atomic weight of lithium in some "natural sources" of lithium ion which had been "contaminated" by lithium salts discharged from isotope separation facilities, which had found its way into ground water. Lithium is used to decrease the melting temperature of glass and to improve the melting behavior of aluminium oxide in the Hall-Héroult process . These two uses dominated the market until

4770-547: The atomic weight of lithium to be around 9.8 g/mol (modern value ~6.94 g/mol). In 1855, larger quantities of lithium were produced through the electrolysis of lithium chloride by Robert Bunsen and Augustus Matthiessen . The discovery of this procedure led to commercial production of lithium in 1923 by the German company Metallgesellschaft AG , which performed an electrolysis of a liquid mixture of lithium chloride and potassium chloride . Australian psychiatrist John Cade

4860-455: The body of the pegmatite, but their original mineral content is replaced by quartz and alkali feldspar, so that they are difficult to distinguish from the surrounding pegmatite. Pegmatite also commonly replaces part of the surrounding country rock. Because pegmatites likely crystallize from a fluid-dominated phase, rather than a melt phase, they straddle the boundary between hydrothermal mineral deposits and igneous intrusions . Although there

4950-488: The body of the pegmatite. The crystals are never aligned in a way that would indicate flow, but are perpendicular to the walls. This implies formation in a static environment. Some pegmatities take the form of isolated pods, with no obvious feeder conduit. As a result, metamorphic or metasomatic origins have sometimes been suggested for pegmatites. A metamorphic pegmatite would be formed by removal of volatiles from metamorphic rocks, particularly felsic gneiss , to liberate

5040-426: The classification is the petrogenetic component of the classification, which shows the association of LCT pegmatites with mainly orogenic plutons, and NYF pegmatites with mainly anorogenic plutons. Lately, there have been a few attempts to create a new classification for pegmatites less dependent on mineralogy and more reflective of their geological setting. On this issue, one of the most notable efforts on this matter

5130-481: The composition of granite while nepheline syenite pegmatite is a pegmatite with the composition of nepheline syenite. However, the British Geological Survey (BGS) discourages this usage, preferring terms like biotite-quartz-feldspar pegmatite for a pegmatite with a typical granitic composition, dominated by feldspar with lesser quartz and biotite. Under BGS terminology, a pegmatitic rock (for example,

5220-451: The end of World War II . The main sources of lithium are brines and ores . Lithium metal is produced through electrolysis applied to a mixture of fused 55% lithium chloride and 45% potassium chloride at about 450 °C. The small ionic size makes it difficult for lithium to be included in early stages of mineral crystallization. As a result, lithium remains in the molten phases, where it gets enriched, until it gets solidified in

5310-402: The final melt fraction of a crystallizing body of magma. However, it is difficult to get a representative composition of a pegmatite, due to the large size of the constituent mineral crystals. Hence, pegmatite is often characterised by sampling the individual minerals that compose the pegmatite, and comparisons are made according to mineral chemistry. A common error is to assume that the wall zone

5400-575: The final stages. Such lithium enrichment is responsible for all commercially promising lithium ore deposits. Brines (and dry salt) are another important source of Li . Although the number of known lithium-containing deposits and brines is large, most of them are either small or have too low Li concentrations. Thus, only a few appear to be of commercial value. The US Geological Survey (USGS) estimated worldwide identified lithium reserves in 2020 and 2021 to be 17 million and 21 million tonnes , respectively. An accurate estimate of world lithium reserves

5490-518: The first quantum degenerate Bose – Fermi mixture. Although it was synthesized in the Big Bang , lithium (together with beryllium and boron) is markedly less abundant in the universe than other elements. This is a result of the comparatively low stellar temperatures necessary to destroy lithium, along with a lack of common processes to produce it. According to modern cosmological theory, lithium—in both stable isotopes (lithium-6 and lithium-7)—was one of

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5580-582: The halides LiF , LiCl , LiBr , LiI , as well as the pseudohalides and related anions. Lithium carbonate has been described as the most important compound of lithium. This white solid is the principal product of beneficiation of lithium ores. It is a precursor to other salts including ceramics and materials for lithium batteries. The compounds LiBH 4 and LiAlH 4 are useful reagents . These salts and many other lithium salts exhibit distinctively high solubility in ethers, in contrast with salts of heavier alkali metals. In aqueous solution,

5670-448: The highest of all solids. Because of this, lithium metal is often used in coolants for heat transfer applications. Naturally occurring lithium is composed of two stable isotopes , Li and Li, the latter being the more abundant (95.15% natural abundance ). Both natural isotopes have anomalously low nuclear binding energy per nucleon (compared to the neighboring elements on the periodic table , helium and beryllium ); lithium

5760-556: The hydrous phase is completely depolymerized, existing almost entirely as orthosilicate , with all oxygen bridges between silicon ions broken. The low viscosity promotes rapid diffusion through the fluid, allowing growth of large crystals. When this hydrous fluid is injected into the surrounding country rock , minerals crystallize from the outside in to form a zoned pegmatite, with different minerals predominating in concentric zones. A typical sequence of deposition begins with microcline and quartz, with minor schorl and garnet . This

5850-400: The largest concentrations in granites . Granitic pegmatites also provide the greatest abundance of lithium-containing minerals, with spodumene and petalite being the most commercially viable sources. Another significant mineral of lithium is lepidolite which is now an obsolete name for a series formed by polylithionite and trilithionite. Another source for lithium is hectorite clay,

5940-418: The last fluid fraction of a large crystallizing magma body. This residual fluid is highly enriched in volatiles and trace elements, and its very low viscosity allows components to migrate rapidly to join an existing crystal rather than coming together to form new crystals. This allows a few very large crystals to form. While most pegmatites have a simple composition of minerals common in ordinary igneous rock,

6030-516: The lightest hydrocarbon oils and is one of only three metals that can float on water, the other two being sodium and potassium . Lithium's coefficient of thermal expansion is twice that of aluminium and almost four times that of iron . Lithium is superconductive below 400 μK at standard pressure and at higher temperatures (more than 9 K) at very high pressures (>20 GPa). At temperatures below 70 K, lithium, like sodium, undergoes diffusionless phase change transformations . At 4.2 K it has

6120-456: The magma is crystallized. Otherwise, the separation of the fluid phase is difficult to explain. Granite requires a water content of 4 wt% at a pressure of 0.5  GPa (72,500  psi ), but only 1.5 wt% at 0.1 GPa (14,500 psi) for phase separation to take place. The volatiles (primarily water, borates , fluorides , chlorides , and phosphates ) are concentrated in the hydrous phase, greatly lowering its viscosity. The silica in

6210-409: The mica gneiss has homogenous mineral layers, with less foliation than the mica schist. It weathers into a dark red soil. The texture of the mica schist is made up of heterogenous layers of minerals. It weathers into a micaceous, brown soil that is distinct from the other soil types in the district. The Cranberry Gneiss rock unit can be found interbedded with other units in the district. The district

6300-436: The microcline are possible. Minor minerals include biotite and garnet. The size of this unit ranges from inches to thousands of feet. It will weather into light-colored soils. Minerals in this unit include talc, amphibole, chlorite, and chrysotile. It will weather to a dark-colored, organic-poor soil. This is a relatively rare unit within the district. The mica and hornblende rock units grade into it. Only about five percent of

6390-427: The middle of the 1990s. After the end of the nuclear arms race , the demand for lithium decreased and the sale of department of energy stockpiles on the open market further reduced prices. In the mid-1990s, several companies started to isolate lithium from brine which proved to be a less expensive option than underground or open-pit mining. Most of the mines closed or shifted their focus to other materials because only

6480-437: The most stable being Li with a half-life of 838 ms and Li with a half-life of 178 ms. All of the remaining radioactive isotopes have half-lives that are shorter than 8.6 ms. The shortest-lived isotope of lithium is Li, which decays through proton emission and has a half-life of 7.6 × 10 s. The Li isotope is one of only five stable nuclides to have both an odd number of protons and an odd number of neutrons,

6570-519: The only active development of which is through the Western Lithium Corporation in the United States. At 20 mg lithium per kg of Earth's crust, lithium is the 31st most abundant element. According to the Handbook of Lithium and Natural Calcium , "Lithium is a comparatively rare element, although it is found in many rocks and some brines, but always in very low concentrations. There are

6660-462: The ore from zoned pegmatites could be mined for a competitive price. For example, the US mines near Kings Mountain , North Carolina, closed before the beginning of the 21st century. The development of lithium-ion batteries increased the demand for lithium and became the dominant use in 2007. With the surge of lithium demand in batteries in the 2000s, new companies have expanded brine isolation efforts to meet

6750-653: The origin of pegmatitic melts and their relative degrees of fractionation. Granitic pegmatites are commonly ranked into three hierarchies (class – family – type – subtype) depending upon their mineralogical-geochemical characteristics and depth of emplacement according to Cerny (1991). Classes are Abyssal, Muscovite, Rare-Element and Miarolitic. The Rare-Element Class is subdivided based on composition into LCT and NYF families: LCT for Lithium, Cesium, and Tantalum enrichment and NYF for Niobium, Yttrium, and Fluorine enrichment. Most authors classify pegmatites according to LCT- and NYF-types and subtypes. Another important contribution of

6840-647: The other four stable odd-odd nuclides being hydrogen-2 , boron-10 , nitrogen-14 , and tantalum-180m . Li is one of the primordial elements (or, more properly, primordial nuclides ) produced in Big Bang nucleosynthesis . A small amount of both Li and Li are produced in stars during stellar nucleosynthesis , but it is further " burned " as fast as produced. Li can also be generated in carbon stars . Additional small amounts of both Li and Li may be generated from solar wind, cosmic rays hitting heavier atoms, and from early solar system Be radioactive decay. Lithium isotopes fractionate substantially during

6930-626: The pegmatites within the district has been found through Ar/Ar dating of micas. They have been dated to approximately 336 million years old. The approximate age of the whole district was taken from Sm/Nd dating in the hornblendes, and was found to be from 470 to 450 million years old. This puts the oldest rocks in the district within the Ordovician period. The master stream of the district is the North Toe River . Major minerals include plagioclase, microcline, quartz, and muscovite. Perthitic textures on

7020-506: The pharmaceutical industry. For laboratory organic synthesis, many organolithium reagents are commercially available in solution form. These reagents are highly reactive, and are sometimes pyrophoric . Like its inorganic compounds, almost all organic compounds of lithium formally follow the duet rule (e.g., BuLi , MeLi ). However, it is important to note that in the absence of coordinating solvents or ligands, organolithium compounds form dimeric, tetrameric, and hexameric clusters (e.g., BuLi

7110-449: The presence of a new element while analyzing petalite ore. This element formed compounds similar to those of sodium and potassium , though its carbonate and hydroxide were less soluble in water and less alkaline . Berzelius gave the alkaline material the name " lithion / lithina ", from the Greek word λιθoς (transliterated as lithos , meaning "stone"), to reflect its discovery in

7200-465: The primary source of lithium either as spodumene, lithiophyllite or usually from lepidolite. The primary source for caesium is pollucite , a mineral from a zoned pegmatite. The majority of the world's beryllium is sourced from non-gem quality beryl within pegmatite. Tantalum, niobium, and rare-earth elements are sourced from a few pegmatites worldwide, such as the Greenbushes Pegmatite ,

7290-474: The production of tritium by itself, as well as a form of solid fusion fuel used inside hydrogen bombs in the form of lithium deuteride . The US became the prime producer of lithium between the late 1950s and the mid-1980s. At the end, the stockpile of lithium was roughly 42,000 tonnes of lithium hydroxide. The stockpiled lithium was depleted in lithium-6 by 75%, which was enough to affect the measured atomic weight of lithium in many standardized chemicals, and even

7380-435: The pure element from its salts. It was not isolated until 1821, when William Thomas Brande obtained it by electrolysis of lithium oxide , a process that had previously been employed by the chemist Sir Humphry Davy to isolate the alkali metals potassium and sodium. Brande also described some pure salts of lithium, such as the chloride, and, estimating that lithia ( lithium oxide ) contained about 55% metal, estimated

7470-439: The right constituents and water, at the right temperature. A metasomatic pegmatite would be formed by hydrothermal circulation of hot alteration fluids upon a rock mass, with bulk chemical and textural change. Metasomatism is currently not favored as a mechanism for pegmatite formation and it is likely that metamorphism and magmatism are both contributors toward the conditions necessary for pegmatite genesis. Most pegmatites have

7560-476: The rising demand. It has been argued that lithium will be one of the main objects of geopolitical competition in a world running on renewable energy and dependent on batteries, but this perspective has also been criticised for underestimating the power of economic incentives for expanded production. Lithium reacts with water easily, but with noticeably less vigor than other alkali metals. The reaction forms hydrogen gas and lithium hydroxide . When placed over

7650-488: The rock units within the district are composed of quartzite. Major minerals include hornblende, quartz, plagioclase, and andesine. Minor minerals include epidote, zoisite, garnet, and sphene. Metamorphic textures in these rocks can either be schistose or gneissic . They transition into the mica gneiss and schist units. Major minerals in both include mica, quartz, plagioclase, and muscovite. Minor minerals for both include garnet, ilmenite, epidote, and apatite. The texture of

7740-485: The three elements synthesized in the Big Bang. Though the amount of lithium generated in Big Bang nucleosynthesis is dependent upon the number of photons per baryon , for accepted values the lithium abundance can be calculated, and there is a " cosmological lithium discrepancy " in the universe: older stars seem to have less lithium than they should, and some younger stars have much more. The lack of lithium in older stars

7830-496: The two stable lithium isotopes found in nature have among the lowest binding energies per nucleon of all stable nuclides . Because of its relative nuclear instability, lithium is less common in the solar system than 25 of the first 32 chemical elements even though its nuclei are very light: it is an exception to the trend that heavier nuclei are less common. For related reasons, lithium has important uses in nuclear physics . The transmutation of lithium atoms to helium in 1932

7920-650: Was gathered mainly by the Soviets during their occupation of Afghanistan from 1979–1989". The Department of Defense estimated the lithium reserves in Afghanistan to amount to the ones in Bolivia and dubbed it as a potential "Saudi-Arabia of lithium". In Cornwall , England, the presence of brine rich in lithium was well known due to the region's historic mining industry , and private investors have conducted tests to investigate potential lithium extraction in this area. Lithium

8010-548: Was supported by the fact that lithium-based soaps have a higher melting point than other alkali soaps, and are less corrosive than calcium based soaps. The small demand for lithium soaps and lubricating greases was supported by several small mining operations, mostly in the US. The demand for lithium increased dramatically during the Cold War with the production of nuclear fusion weapons . Both lithium-6 and lithium-7 produce tritium when irradiated by neutrons, and are thus useful for

8100-470: Was the first fully human-made nuclear reaction , and lithium deuteride serves as a fusion fuel in staged thermonuclear weapons . Lithium and its compounds have several industrial applications, including heat-resistant glass and ceramics , lithium grease lubricants, flux additives for iron, steel and aluminium production, lithium metal batteries , and lithium-ion batteries . These uses consume more than three-quarters of lithium production. Lithium

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