Seligmannite
Seligmannite | |
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Seligmannite from Palomo mine, Castrovirreyna Province, Huancavelica Department, Peru | |
General | |
Category | Sulfide minerals |
Formula (repeating unit) | PbCuAsS3 |
Strunz classification | 2.GA.50 |
Crystal system | Orthorhombic |
Identification | |
Formula mass | 441.87 gm |
Color | Lead gray to black |
Crystal habit | Massive to Crystalline |
Crystal symmetry |
Orthorhombic - dipyramidal H-M symbol (2/m 2/m 2/m) Space group: Pmmn |
Twinning | on {110} very common |
Cleavage | Indistinct on the {001}, {100}, and {010} |
Fracture | Conchoidal |
Tenacity | Brittle |
Mohs scale hardness | 3 |
Luster | Metallic |
Streak | Black to chocolate brown |
Density | 5.38 - 5.44 g/cm3 |
Optical properties | Anisotropic |
References | [1][2] |
Seligmanite is a rare mineral, with the chemical formula PbCuAsS3. Originally described from the Lengenbach Quarry, Valais Canton, Switzerland; it has also been found in the Raura district, Lima Region, Peru; at Tsumeb, Oshikoto Region, Namibia; and at the Sterling Mine, Sussex County, New Jersey, US.
References
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