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Seligmannite

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Seligmannite
Seligmannite from Palomo mine, Castrovirreyna Province, Huancavelica Department, Peru
General
CategorySulfide minerals
Formula
(repeating unit)
PbCuAsS3
Strunz classification2.GA.50
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPmmn
Identification
Formula mass441.87 g/mol
ColorLead gray to black
Crystal habitMassive to Crystalline
Twinningon {110} very common
CleavageIndistinct on the {001}, {100}, and {010}
FractureConchoidal
TenacityBrittle
Mohs scale hardness3
LusterMetallic
StreakBlack to chocolate brown
Density5.38 - 5.44 g/cm3
Optical propertiesAnisotropic
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