Holotype (sample P1P 78/2020) specimen of stibiogoldfieldite. Reflected light images of holotype stibiogoldfieldite, as anhedral grains up to 0.6 mm across in quartz. Field of view: 0.6 mm. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/ ). — Photo: Cristian Biagioni, Jiří Sejkora, Silvia Musetti, Emil Makovicky, Renato Pagano, Marco Pasero and Zdeněk Dolníček · CC BY-SA 4.0
Stibiogoldfieldite
Stibiogoldfieldite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu₆Cu₆(Sb₂Te₂)S₁₃.
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 5.055; Gray streak; Metallic luster.
IMA status: approved, named in 2021.
Formed by late-stage Te-bearing hydrothermal fluids in epithermal precious metal deposits hosted in altered volcanic rocks.
It is found associated with Quartz, pyrite, a Ag-Bi-(S, Se) phase (holotype); quartz, pyrite, calaverite, bismuthinite, bohdanowiczite, a Ag-Bi-(S, Se) phase (cotype).
Prefix, stibio, identifies the analog of goldfieldite with Sb > (As, Bi) in the D site.