Loading AI tools
From Wikipedia, the free encyclopedia
Vauquelinite is a complex mineral with the formula CuPb2(CrO4)(PO4)(OH) making it a combined chromate and phosphate of copper and lead. It forms a series with the arsenate mineral fornacite.[2]
Vauquelinite | |
---|---|
General | |
Category | Phosphate mineral |
Formula (repeating unit) | CuPb2(CrO4)(PO4)(OH) |
IMA symbol | Vql[1] |
Strunz classification | 7.FC.05 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/n |
Unit cell | a = 13.754(5) Å, b = 5.806(6) Å c = 9.563(3) Å; β = 94.55°; Z = 4 |
Identification | |
Color | Olive-green, apple-green, brown to nearly black |
Crystal habit | Irregular wedge shaped crystals, mammillary, reniform masses |
Twinning | Present on {102} |
Cleavage | Indistinct |
Fracture | Irregular |
Tenacity | Brittle |
Mohs scale hardness | 2.5 – 3 |
Luster | Adamantine, resinous |
Streak | Greenish or brownish |
Diaphaneity | Translucent |
Specific gravity | 6.16 |
Optical properties | Biaxial (−) |
Refractive index | nα = 2.110 nβ = 2.220 nγ = 2.220 |
Birefringence | δ = 0.110 |
Pleochroism | X = Light green, Y = Light brown, Z = Light brown |
2V angle | Near zero |
References | [2][3][4] |
It was first described in 1818 in the Beryozovskoye deposit, Urals, Russia, and named for Louis Vauquelin (1763–1829), a French chemist.[2] It occurs in oxidized hydrothermal ore deposits and is associated with crocoite, pyromorphite, mimetite, cerussite, beudantite and duftite at the type locality in Russia.[4]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.