Formula: CuInS2
From Alfredo Petrov:
ROQUESITE (injiumu-dohkoh)
- Hokkaido: In the Sorachi vein at the Toyoha mine. (NB: The main indium mineral here is not roquesite, but unnamed CuZn2InS4.)
- Hyougo: Bluish silver blebs and stringers around the edge of small chalcopyrite masses in magnetite-cassiterite-bearing ore in propylitic country rock of subvolcanic origin at the Akenobe mine; and as inclusions in chalcopyrite in magnetite-bearing massive chalcopyrite ore. Also from the Ikuno mine. (Caveat emptor: A lot of the Hyougo prefecture “roquesite” specimens circulating among systematic rare species collectors, even the supposedly “analysed” ones, not only are not roquesite but contain no indium at all! Most commonly = Cu sulphide.)
- Shizuoka: Anhedral grains from 0.1 to 0.4mm at the Kawazu mine.
- Tochigi: Bright grey roquesite is associated with more abundant blacker grey matildite in the matildite-electrum zone at the Nishizawa mine.
Above: Roquesite, Kawazu mine (Rendaiji mine; Rendaizi mine), Rendaiji, Shimoda City, Shizuoka Prefecture, Japan. Width of view 14mm. Tiny metallic patches in quartz.
