Seligmannite

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Seligmannite
Seligmannite-217331.jpg
Seligmannite from Palomo mine, Castrovirreyna Province, Huancavelica Department, Peru
General
Category Sulfide minerals
Formula
(repeating unit)
PbCuAsS3
Strunz classification 02.GA.50
Identification
Formula mass 441.87 gm
Color Lead gray to black
Crystal habit Massive to Crystalline
Crystal system Orthorhombic - Dipyramidal
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, USA.

References[edit]