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Mineralpedia Details for Millerite

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Millerite

Millerite

Formula
NiS 
Crystal System
Trigonal 
Crystal Habit
Acicular, Massive 
Cleavage
Perfect, Perfect, None 
Luster
Metallic 
Color
bronze, greenish gray, gray, brass yellow 
Streak
greenish black 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
3-3.5 
WebMineral
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Mindat
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Millerite from Palabora mine, Phalaborwa, Limpopo, South Africa

Millerite
            from Palabora mine, Phalaborwa, Limpopo, South Africa

Brassy metallic Millerite in a radial pattern embedded in course Calcite matrix with a green crust of a secondary Copper mineral (Cu-Carbonate).

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Millerite from Universal Colliery, Senghenydd, Caerphilly, Wales

Millerite
            from Universal Colliery, Senghenydd, Caerphilly, Wales

13mm long golden Millerite crystals in divergent spray.

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Millerite from Gap mine, Lancaster Co., Pennsylvania, United States

Millerite
            from Gap mine, Lancaster Co., Pennsylvania, United States

I believe this is a good specimen of Millerite for this locality. There are a number of Millerite groups and the largest in the center is 1cm. 

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Millerite from Flat River, St. Francois Co., Missouri, United States

Millerite
            from Flat River, St. Francois Co., Missouri, United States

Filliform Millerite crystals to 8mm with some longer crystals on dolomite.

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Millerite from Sudbury dist., Ontario, Canada

Millerite
            from Sudbury dist., Ontario, Canada

Brassy, gold platy Millerite, an uncommon habit for this mineral. The two overall photos represent the color the best.

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