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Formula: Sb2(Sb,As)2
A very rare, natural antimony-rich,
arsenic-bearing alloy
Crystal System: Monoclinic
Specific gravity: 6.5 measured, 6.44 calculated
Hardness: 3
Streak: Black
Colour: Silver-white
Environments
Localities
The type locality is Broken Hill, Broken Hill district, Yancowinna county, New South Wales, Australia. In a
museum hand specimen purportedly from this locality, paradocrasite is mainly an aggregate of small,
diversely oriented, brilliant silver-white, stubby prisms, each about 0.5 mm long, embedded in a matrix of
white calcite. Some prisms are striated parallel to the long axis. A
few prisms are curved. The ends of the prisms are rough, showing intersecting domains that represent complex,
repeated twins. A few nests of curved, grooved pseudohexagonal plates are also present. Paradocrasite
is brittle, crushing readily to fine dust.
Some doubt has been expressed as to whether this specimen really originated from Broken Hill
(AM 56.1127-1146).
The paradocrasite replaces calcite, and is associated with
antimony-bearing
löllingite, stibarsen
and calcite
(HOM).
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