Laforêtite
Laforêtite is an IMA-recognized mineral species in the sulfide class, with the chemical formula AgInS₂.
It crystallizes in the tetragonal crystal system (space group I-42d). It is a member of the Chalcopyrite structural group.
Key properties: Mohs hardness 3; specific gravity 4.93; optically biaxial.
IMA symbol Laf, IMA status: approved, named in 1995.
Found in a dump sample from a vein-type hydrothermal ore deposit (Montgros mine, France); in a vein-type hydrothermal ore deposit (Toyoha mine, Japan).
It is found associated with Galena, sphalerite, barite, ankerite, quartz (Montgros mine, France); sphalerite, hocartite, pyrargyrite (Toyoha mine, Japan).
In honor of Claude P. Laforêt (1936–), French metallographer, Bureau de Recherches Géologiques et Minières, Orléans, France, who first observed the species.