Benjaminite

benjaminite

aikinite

skutterudite

rammelsbergite

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Formula: Ag3Bi7S12
Sulphosalt, silver and bismuth bearing mineral
Specific gravity: 6.34
Hardness: 3½
Streak: Dull lead-grey
Colour: Grey, tarnishes dull or yellow to copper-red
Environments

Hydrothermal environments

Localities

There are three co-type Localities, the Silver Bear mine, Camsell River area, Northwest Territories, Canada, the Keeley-Frontier mine, South Lorrain Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada, and the Outlaw Mine, Round Mountain Mining District, Toquima Range, Nye County, Nevada, USA.

At the A W Mine, Bolivia, Clive county, New South Wales, Australia, benjaminite occurs in a molybdenite pipe deposit, associated with molybdenite, bismuth and bismuthinite (HOM).

At the the Silver Bear mine, Camsell River area, Northwest Territories, Canada, one of the type localities, benjaminite is associated with safflorite, skutterudite, rammelsbergite, arsenopyrite, nickeline, matildite, bismuthinite, chalcopyrite, pyrite, sphalerite, galena, bismuth and silver (HOM).

At the the Keeley-Frontier mine, South Lorrain Township, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada, one of the type localities, benjaminite occurs in a veinlet in calcite (HOM).

At the Outlaw Mine, Round Mountain Mining District, Toquima Range, Nye County, Nevada, USA, one of the type localities, benjaminite occurs in a quartz vein near the contact of an albite-granite and an intrusive rhyolite. Associated minerals include aikinite, chalcopyrite, pyrite, fluorite, covellite, chalcocite, muscovite, molybdenite and quartz (AM 38.550-552, HOM, Mindat).

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