Berryite | |
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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 |
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.
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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