Formula: Pb4Sb6S13
Sulphosalt
Crystal System: Monoclinic
Specific gravity: 6.7 measured, 6.87 calculated
Hardness: 2½ to 3
Streak: Grey
Colour: Lead-grey
Common impurities: Bi
Environments:
Robinsonite is a primary hydrothermal mineral associated with
zinkenite, boulangerite,
semseyite, plagionite,
stibnite, sphalerite,
galena, pyrite,
quartz and calcite
(HOM).
Localities
The type locality, the Red Bird Mine, Antelope Springs Mining District, Pershing county, Nevada, USA, is a low temperature hydrothermal deposit.
Here robinsonite occurs as a primary mineral with
pyrite, sphalerite,
stibnite and boulangerite in small pieces in oxidised
ore bodies. The gangue minerals identified are quartz,
calcite
and aragonite variety tarnowitzite. A slab about 1 cm thick was cut through the analysed sample. The slab is composed
of boulangerite and robinsonite, and the core is speckled by small inclusions of
quartz, usually rimmed by tiny crystals of pyrite. A few small
areas of bindheimite are also seen within the
boulangerite - robinsonite mass. This mass is completely rimmed by about a centimeter of
the alteration product bindheimite. Small inclusions of
minium are found in the bindheimite
(AM 37.438-446).
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