Type material for tetrahedrite-(Hg). (c) Massive aggregate with quartz. Size: 11 cm × 6 cm × 7 cm. Rožňava ore field, Slovakia (sample no. P1N 33538). — Photo: Biagioni, C., Sejkora, J., Musetti, S., Velebil, D., & Pasero, M. · CC BY 4.0
Tetrahedrite-(Hg)
Tetrahedrite-(Hg) is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu₆(Cu₄Hg₂)Sb₄S₁₃.
It crystallizes in the cubic crystal system (space group I-43m). It is a member of the Tetrahedrite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 5.326; Black streak; Metallic luster.
IMA symbol Ttr-Hg, IMA status: approved, named in 2019.
Found in metamorphosed (greenschist facies) pyrite ± baryte ± iron-oxide deposits.
It is found associated with Cinnabar, chalcostibite in dolomite veins (Buca della Vena); baryte, chalcopyrite in quartz-siderite-dolomite veins (Jedová hora).
The (Hg)-suffix indicates the mercury analog of tetrahedrite-(Zn) and tetrahedrite-(Cu).