Chemistry:Berryite
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Short description: Sulfosalt mineral
| Berryite | |
|---|---|
 Black acicular crystals of the rare Pb-Ag sulfide from a Colorado locality: Mike Mine, San Juan County, Colorado, United States | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | Cu3Ag2Pb3Bi7S16 |
| Strunz classification | 2.HB.20d (10th) |
| Dana classification | 3.6.15.1 |
| Crystal system | Monoclinic |
| Crystal class | 2/m (Prismatic) |
| Unit cell | 1,445.93 Å3 |
| Identification | |
| Colour | Bluish-grey, white, grey-white |
| Twinning | Repeated |
| Cleavage | Poor/indistinct |
| Mohs scale hardness | 3.5 |
| |re|er}} | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 6.7 |
| Density | 6.7 g/cm3 (measured) |
| Pleochroism | Weak |
Berryite is a mineral with the formula Pb
3(Ag,Cu)
5Bi
7S
16. It occurs as gray to blue-gray monoclinic prisms. It is opaque and has a metallic luster. It has a Mohs hardness of 3.5 and a specific gravity of 6.7.
It was first identified in 1965 using X-ray diffraction by mineralogist Leonard Gascoigne Berry (1914–1982). It is found in Park and San Juan counties in Colorado. It occurs in sulfide bearing quartz veins in Colorado and with siderite-rich cryolite in Ivigtut, Greenland.
References
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
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