Incident-light image of biagioniite associated with stibarsen on a calcite matrix. Museo di Storia Naturale of the University of Florence, catalogue number 46582/G. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( https://creativecommons.org/licenses/by/4.0/ ). — Photo: Bindi, L., & Moëlo, Y. · CC BY 4.0
Biagioniite
Biagioniite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Tl₂SbS₂.
It crystallizes in the monoclinic crystal system (space group Pc). It is a member of the Dervillite structural group.
Key properties: Mohs hardness 3; specific gravity 6.192; Black streak; Metallic luster.
IMA symbol Bgi, IMA status: approved, named in 2020.
Found in a hydrothermal gold deposit along a shear zone.
It is found associated with Aurostibite, stibarsen, native gold, calcite.
The mineral was named to honor Cristian Biagioni (b. 1981), Associate Professor of Mineralogy, Department of Earth Sciences, University of Pisa, Italy.