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Boulangerite

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boulangerite [bu̇′lan·jə‚rīt]
(mineralogy)
Pb5Sb4S11A bluish-lead-gray, monoclinic mineral consisting of lead antimony sulfide.
Boulangerite 

(named for the French mineralogist C. L. Boulanger, died 1849), a mineral, a complex sulfide. Its chemical composition is Pb5Sb4S11 Boulangerite crystallizes in a monoclinic system, forming greatly extended needlelike crystals or, more often, ray-shaped or stringy aggregates. Its color is silver gray to lead gray. Boulangerite has a hardness of 2.5-3.0 on the mineralogical scale, and its density is 6,230 kg/m3. It forms in ore veins of complex polymetallic formations. In the USSR there are deposits of boulangerite in Transbaikalia, Uzbekistan, and the Ukraine. Abroad, there are deposits in Czechoslovakia, the German Democratic Republic, France, Sweden, and the USA. Boulangerite is a secondary lead ore.
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They can be weakly mineralized in places with arsenopyrite, pyrite and rare jamesonite and boulangerite in a quartz gangue.
Great mining camps of Canada 1. The history and geology of the Keno ... by Cathro, R.J. / Geoscience Canada
 
 
 
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