descloizite
Sign in to saveDescloizite is a rare mineral species consisting of basic lead and zinc vanadate, , crystallizing in the orthorhombic crystal system and isomorphous with olivenite. Appreciable gallium and germanium may also be incorporated into the crystal structure.
Key facts
- Mineral.name
- Descloizite
- Mineral.category
- Vanadate mineral
- Mineral.image
- Descloizite-162484.jpg
- Mineral.caption
- Descloizite specimen from Berg Aukas (Berg Aukus), Namibia, 9.5 x 8.9 x 4.9 cm
- Mineral.formula
- (Pb,Zn)2VO4OH
- Mineral.IMAsymbol
- Dcz
- Mineral.strunz
- 8.BH.40
- Mineral.system
- Orthorhombic
- Mineral.class
- Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
- Mineral.symmetry
- Pnma (no. 62)
- Mineral.unit cell
- a = 7.593, b = 6.057 c = 9.416 [Å]; Z = 4
- Mineral.color
- Brownish red, red-orange, reddish to blackish brown, nearly black
- Mineral.habit
- Zoned tabular crystals common, encrustations and plumose aggregates
- Mineral.cleavage
- None
- Mineral.fracture
- Irregular, sub-conchoidal
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 3 – 3.5
- Mineral.luster
- Greasy
via Wikipedia infobox
Article
3 sectionsContents
- Discovery and occurrence
- See also
- References
Descloizite is a rare mineral species consisting of basic lead and zinc vanadate, , crystallizing in the orthorhombic crystal system and isomorphous with olivenite. Appreciable gallium and germanium may also be incorporated into the crystal structure.
The color is deep cherry-red to brown or black, and the crystals are transparent or translucent with a greasy lustre; the streak is orange-yellow to brown; specific gravity 5.9 to 6.2; hardness 31/2. A variety known as cuprodescloizite is dull green in color; it contains a considerable amount of copper replacing zinc and some arsenic replacing vanadium. There is also an arsenate analogue called arsendescloizite.