The rare mineral adelite, is a calcium , magnesium , arsenate with chemical formula CaMgAsO 4 OH. It forms a solid solution series with the vanadium -bearing mineral gottlobite . Various transition metals substitute for magnesium and lead replaces calcium leading to a variety of similar minerals in the adelite– duftite group .
4-519: Adelite forms variably colored (blue, green, yellow and grey) crystals in the orthorhombic crystal system. The form is typically massive . It has a Mohs hardness rating of 5 and a specific gravity of 3.73 to 3.79. It was first described in 1891 from Värmland , Sweden . Its name comes from the Greek word for indistinct . Adelite has been found in ore deposits in Algeria , Germany , Italy , Sweden and
8-399: A rectangular base ( a by b ) and height ( c ), such that a , b , and c are distinct. All three bases intersect at 90° angles, so the three lattice vectors remain mutually orthogonal . There are four orthorhombic Bravais lattices: primitive orthorhombic, base-centered orthorhombic, body-centered orthorhombic, and face-centered orthorhombic. For the base-centered orthorhombic lattice,
12-453: The US . This article about a specific mineral or mineraloid is a stub . You can help Misplaced Pages by expanding it . Orthorhombic In crystallography , the orthorhombic crystal system is one of the 7 crystal systems . Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with
16-441: The primitive cell has the shape of a right rhombic prism; it can be constructed because the two-dimensional centered rectangular base layer can also be described with primitive rhombic axes. Note that the length a {\displaystyle a} of the primitive cell below equals 1 2 a 2 + b 2 {\displaystyle {\frac {1}{2}}{\sqrt {a^{2}+b^{2}}}} of
#701298