Roquesite (grey, CuInS 2 ), as an inclusion in Bornite Locality: Charrier, Département Allier, France Exposed in the Mineralogical Museum of University Bonn, Germany — Photo: Ra'ike · CC BY-SA 3.0
Roquesite
Roquesite is an IMA-recognized mineral species in the sulfide class, with the chemical formula CuInS₂.
It crystallizes in the tetragonal crystal system (space group I-42d). It is a member of the Chalcopyrite structural group.
Key properties: specific gravity 4.78; Metallic. Anisotropism: Very weak. R1 –R2: (400) 25.8–25.0, (420) 25.3–24.8, (440) 24.5–24.5, (460) 23.8–23.9 luster.
IMA symbol Ro, IMA status: approved, named in 1962.
Found in association with copper sulfides in high-temperature Sn–W–Bi–Mo hydrothermal veins in highly metamorphosed rocks (Charrier, France); a late-stage mineral in a skarn Fe–W ore pipe (Ulsan mine, South Korea).
It is found associated with Chalcopyrite, bornite, cubanite, covellite, sphalerite, tetrahedrite, emplectite, wittichenite, stannoidite, pyrite, löllingite, arsenopyrite, bismuth.
The mineral was named to honor Professor Maurice Roques (1911–), French geologist, University of Clermont-Ferrand, Clermont-Ferrand, France.