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Formula: CoSbS
Sulphide, cobaltite group, forms a series with
ullmannite;
cobalt and antimony bearing mineral
Specific gravity: 6.76
Hardness: 5 to 5½
Streak: Greyish black
Colour: Tin-white, steel-grey
Common impurities: Fe,As
Environments
Willyamite occurs in calcite-siderite veins
associated with calcite, dyscrasite and
siderite
(Mindat).
Localities
At the type locality, the Consols Mine, Broken Hill, Broken Hill district, Yancowinna county, New South Wales,
Australia, willyamite
occurs as crystals several millimetres on a side, showing zonal growth patterns. Associated Minerals include
dyscrasite, costibite,
calcite and siderite
(HOM, Mindat).
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