2 : SULFIDES and SULFOSALTS (sulfides, selenides,
tellurides; arsenides, antimonides, bismuthides; sulfarsenites,
sulfantimonites, sulfbismuthites, etc.) C : Metal Sulfides, M: S = 1: 1 (and similar)
D : With Sn, Pb, Hg, etc.
is a member of the Galena Group of minerals that also
Clausthalite is one of the most common selenide minerals.
It is very similar to Galena because they have
basically the same structure but Clausthalite has a
greater density and lacks good crystals. It is
opaque with a bright lead-gray color, metallic luster
and a Mohs hardness of 2.5 - 3.0. Clausthalite is named
after the discovery locality at Clausthal-Zellerfeld, Harz Mountains, Germany.
The picture above shows a gem with veins of bright,
metallic Clausthalite in Calcite matrix.
in Germany, from the Charlotte mine, Clausthal, 13 km
south-southwest of Goslar [TL], Tilkerode, Lerbach,
and Zorge, in the Harz Mountains, and at Schneeberg,
Saxony. At Skrikerum, Sweden. From Hope’s Nose, Torquay,
Devon, England. In the Czech Republic, at Bukov, near
Tisnova; in the Petrovice uranium deposit, near Ždár;
and the Predborice uranium deposit, near Krásna
Hora. In the USA, in the Blue Range Wilderness Area,
Greenlee County, Arizona; and at the Essex mine, Darwin,
Inyo County, California. In the Goldfields district,
Saskatchewan; in the Kidd Creek mine, near Timmins,
and the Hemlo gold deposit, Thunder Bay district, Ontario,
Canada. In Argentina, from the Sierra de Umango; in
the Santa Brigida mine; at Tuminico, Sierra de Cacho;
and from Los Llantenes, La Rioja Province, and from
Cerro de Cacheuta, Mendoza Province. At the Pacajake
mine, Hiaco, 24 km east-northeast of Colquechaca, Potosí,
Bolivia. From El Sharana, Northern Territory, Australia.
At Tsumeb, Namibia. Other minor occurrences are known.
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