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bismuthinite

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bismuthinite [bɪzˈmʌθɪˌnaɪt], bismuth glance
n
(Earth Sciences / Minerals) a grey mineral consisting of bismuth sulphide in orthorhombic crystalline form. It occurs in veins associated with tin, copper, silver, lead, etc., and is a source of bismuth. Formula: Bi2S3


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Sulfide minerals in the quartz veins are much more varied than in replacement ores; pyrite masses in the former contain up to 2% arsenopyrite and trace to minor amounts of galena, sphalerite, scheelite, pyrrhotite, chalcopyrite, cosalite and bismuthinite.
Mineralization is characterized by sugary textured quartz veins and locally vein stockworks of variable orientations associated with intrusive and country rock (gneisses) containing trace to 2 percent sulfides characterized by arsenopyrite +/- bismuthinite +/- molybdenite and, locally, visible gold.
Quartz veins at American Eagle host extremely course grained bismuthinite in flat, sometimes deformed tabular plates ranging up to 1.
 
 
 
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