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Formula: NiSbS
Sulphide, cobaltite group, forms a series with
willyamite
Crystal System: Isometric
Specific gravity: 6.65 measured, 6.793 calculated
Hardness: 5 to 5½
Streak: Black, greyish black
Colour: Tin-white, steel grey
Common impurities: Fe,Co,As,Bi
Environments:
Ullmannite is a nickel antimony sulphide that
occurs in hydrothermal veins, associated with
nickeline,
gersdorffite, pentlandite,
chalcopyrite, pyrrhotite,
galena, tetrahedrite and
dyscrasite (HOM).
The type locality is the Storch und Schöneberg Mine, Gosenbach, Siegen, Siegerland, North Rhine-Westphalia, Germany
At Brownley Hill, Cumbria, England, UK, ullmannite has been found as a
primary mineral on
galena and associated with bottinoite,
cerussite and sulphur
(MinRec 31.3.248).
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