Seligmannite
(repeating unit)PbCuAsS3 IMA symbol Seli[1] 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 [2][3]
H-M symbol: (2/m 2/m 2/m)
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.
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