Seligmannite
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.
| Seligmannite | |
|---|---|
 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 |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pmmn |
| Identification | |
| Formula mass | 441.87 g/mol |
| Color | Lead gray to black |
| Crystal habit | Massive to Crystalline |
| 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] |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.