Chemistry:Clausthalite

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Clausthalite
Clausthalite-207330.jpg
General
CategorySelenide mineral
Formula
(repeating unit)
PbSe
Strunz classification2.CD.10
Dana classification02.08.01.02
Crystal systemIsometric
Crystal classHexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space groupFm3m
Identification
ColorBluish gray to lead-gray
Crystal habitMassive to granular with euhedral crystals
Cleavage{001} Perfect, {010} Perfect, {100} Perfect
Mohs scale hardness2.5
|re|er}}Metallic
Streakgrayish black
Diaphaneityopaque
Specific gravity7.6 - 8.8
References[1][2][3][4]

Clausthalite is a lead selenide mineral, PbSe. It forms a solid solution series with galena PbS.

Occurrence

It occurs in low-sulfur hydrothermal deposits with other selenides and in mercury deposits. It is associated with tiemannite, klockmannite, berzelianite, umangite, gold, stibiopalladinite and uraninite.[2]

It was first described in 1832 and named for the discovery locality of Clausthal-Zellerfeld in the Harz Mountains, Germany .[4]

See also

References