Tennantite-(In)

tennantite-(In)

seligmannite

watanabeite

roquesite

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Formula: Cu₆(Cu₅In)As₄S₁₃
Valence: Cu¹⁺₆(Cu¹⁺₅In³⁺)As³⁺₄S^2-₁₃
Sulpharsenite, tennantite subgroup, tetrahedrite group
Crystal system: Isometric
Specific gravity: 4.763 calculated
Hardness: 3½ to 4
Streak: Black
Colour: Black
Common impurities: Fe,Zn,Sb,Te,Sn,Mn,Se
Environments

Volcanic igneous environments
Hydrothermal environments

Tennantite-(In) is a new mineral, approved in 2023 and to date (January 2026) reported only from Alexandroupoli.

Localities

At the type locality, the Pefka deposit, Alexandroupoli, Evros, Eastern Macedonia and Thrace, Greece, tennantite-(In) was identified as anhedral grains, up to 0.1 mm in size, in the epithermal ore deposit. Associated minerals include bournonite, galena, quartz, roquesite, seligmannite, tennantite-(Fe) and watanabeite (Mindat).

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