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Mineralpedia Details for Ullmannite

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Ullmannite

Ullmannite

The discoverer of the mineral, Johan Christoph Ullmann, a German chemist and mineralogist, is the namesake for Ullmannite. Relatively common and widespread, Ullmannite is found with nickel-bearing minerals in hydrothermal veins.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/ullmannite.pdf

Formula
NiSbS 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive 
Cleavage
Good, Good, Good 
Luster
Metallic 
Color
steel gray, silver white, tin white 
Streak
grayish black 
Class
Isometric - Tetartoidal 
Fracture
Brittle 
Hardness
5.5 
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Ullmannite from Monte Narba, Sarrabus, Sardinia, Italy

Ullmannite
            from Monte Narba, Sarrabus, Sardinia, Italy

Silvery, cubic crystals to 5mm.

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Ullmannite from Siegen, Westphalia, Germany

Ullmannite
            from Siegen, Westphalia, Germany

Grey silvery rich mass.

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