Seligmannite

Infobox mineral
name = Seligmannite
category = Sulfide Mineral
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formula = PbCuAsS₃
molweight = 441.87 gm
color = Lead gray to black
habit = Massive to Crystaline
system = Orthorhombic - Dipyramidal
twinning = on {110} very common
cleavage = Indistinct on the {001}, {100}, and {010}
fracture = Conchoidal
tenacity = Brittle
mohs = 3
luster = Metallic
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opticalprop = Anisotropic
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streak = Black to chocolate brown
gravity =
density = 5.38 - 5.44 g/cm₃
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references = [ [http://www.mindat.org/min-3613.html Seligmannite: Seligmannite mineral information and data ] ] [ [http://www.webmineral.com/data/Seligmannite.shtml Seligmannite Mineral Data ] ]

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