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Mineralpedia Details for Tennantite

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Tennantite

Tennantite

Named to honor Professor Smithson Tennant, a chemist of Oxford University at Oxford, England. Tennantite occurs in deposits metamorphosed by contact metamorphism as well as in hydrothermal veins. Found in over a thousand localities and related to tetrahedrite, but is more rare than tetrahedrite.

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

Formula
Cu12As4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive, Disseminated 
Cleavage
None, None, None 
Luster
Metallic 
Color
steel gray, black 
Streak
reddish gray 
Class
Isometric - Hextetrahedral 
Fracture
Hackly 
Hardness
3.5-4 
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Tennantite from Leonard mine, Butte dist., Silver Bow Co., Montana, United States

Tennantite
            from Leonard mine, Butte dist., Silver Bow Co., Montana, United States

2mm tetrahedras which are rimmed with perhaps a different mineral, possibly Chalcocite. The cores are a brilliant silver, while the rims are a brassy chalcocite color and the outer rim is a dull, pitted, black or dark grey. There are numerous minute clusters of Quartz about the matrix.

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Tennantite from Dzhezkazgan mine, Karagandy, Kazakhstan

Tennantite
            from Dzhezkazgan mine, Karagandy, Kazakhstan

Crystal group with individual crystals to 6mm.

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Tennantite from Cornwall, England

Tennantite
            from Cornwall, England

An interesting specimen with hundreds of well developed crystals to 1mm on sulfide matrix. The cavity on which the crystals have formed is large and is 6x5cm across and composed mostly of Chalcocite. The rest of the matrix is sulfide, probably Chalcopyrite There is also some vugs on the backside.

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Tennantite from Tsumeb mine, Tsumeb, Namibia

Tennantite
            from Tsumeb mine, Tsumeb, Namibia

Two good Tennantite crystals - 1.9 and 1.4cm.

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