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Formula: Ag3Bi7S12
Sulphosalt, pavonite homologous series group,
silver- and bismuth-
bearing mineral
Crystal System: Monoclinic
Specific gravity: 6.34 measured, 6.68 calculated
Hardness: 3½
Streak: Dull lead-grey
Colour: Grey, tarnishes dull or yellow to copper-red
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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