Seligmanite

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.

Seligmannite
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]

 

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.