Tennantite-(Ni)

tennantite-(Ni)

vaesite

gersdorffite

magnesiochromite

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Formula: Cu₆(Cu₄Ni₂)As₄S₁₃
Sulphosalt, tennantite subgroup, tetrahedrite group
Crystal System: Isometric
Specific gravity: 4.626 calculated
Hardness: 3 to 3½
Streak: Reddich black
Colour: Black
Environments

Igneous environments
Hydrothermal environments

Tennantite-(Ni) is a new mineral, approved in 2021 and to date (August 2023) reported only from the type locality.

Localities

At the type locality, the Luobusha ophiolite, Qusum county, Shannan Prefecture, Tibet, China, tennantite-(Ni) has been discovered from chromitite as anhedral grains ranging from 2 to 20 μm in size, comprising small composite inclusions composed of tennantite-(Ni) and vaesite in gersdorffite. Most associated minerals are secondary, and include magnesiochromite, dolomite, magnesite and quartz (MM 87.591-598, Mindat).

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