Tennantite-(Cu)

tennantite-(Cu)

enargite

chalcopyrite

vinciennite

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Formula: Cu6(Cu4Cu2)As4S13
Sulphosalt, tetrahedrite group
Specific gravity: 4.656 calculated
Hardness: 3½ to 4
Colour: Black
Environments

Hydrothermal environments

Tennantite-(Cu) is a new mineral, approved in 2021.

Localities

At the type locality, the Layo deposit, Castilla Province, Arequipa, Peru, tennantite-(Cu) occurs at the epithermal deposit as black metallic anhedral grains, up to 0.1 mm across, replacing enargite and associated with chalcopyrite and vinciennite (MM 86.2.331-339).

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