Berryite is a mineral with the formula Pb3(Ag,Cu)5Bi7S16. 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.
| Berryite | |
|---|---|
Black acicular crystals of the rare Pb-Ag sulfide from a Colorado locality: Mike Mine, San Juan County, Colorado, United States
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| General | |
| Category | Mineral |
| Formula (repeating unit) | Cu3Ag2Pb3Bi7S16 |
| IMA symbol | Bry[1] |
| 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 |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 6.7 |
| Density | 6.7 g/cm3 (measured) |
| Pleochroism | Weak |
It was first identified in 1965 using X-ray diffractionbymineralogist 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 cryoliteinIvigtut, Greenland.
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