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 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]

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[edit]