Sulphides: Millerite
Diagnostic card.
Ni S (nickel sulphide)
The trigonial trigonometric system
Hardness 3,5
Specific weight 5.2-5.6
Cleavage is good
Crack irregular
Yellow color
Color in powder greenish-black
Glitter metal
In appreciable amounts, it is very rare. Usually present in the form of needle and tangled fibrous intergrowth of crystals. Seldom there are clearly prismatic forms. Radiation and star aggregates are also found; Smaller dense massive accumulations or fibrous inclusions are more rare. The color is brass yellow, bright; Can also be covered with a slight greenish-gray coating.
Place of Birth.
Found in Bohemia, Germany in the form of knotty crystals, among the siderite in the Galeš deposit. In the USA, radiant aggregates are found in hematite in the state of New York; The velvety formations on the surface of pyrrhotite are in the state of Pennsylvania. In California, Millerite is met along with cinnabar. In Ontario it was discovered together with the Mauherite on the crystals of uvarovite. A richer deposit with significant massive inclusions (with cleavage) is Temancani in Ontario (Canada). In Italy, the mineral is dispersed in the hydrothermal formations of the Apennines in the Bologna region. Finally, it is found in meteorites.
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