Formula: (Cu,Zn,Fe)3(In,Sn)S4 From Alfredo Petrov: SAKURAIITE (sakurai-koh) Above: Sakuraiite, stannite, chalcopyrite, sphalerite, Ikuno Mine, Hyogo Prefecture, Japan. Width of view 14mm. Greenish-grey sakuraiite (running from top right to centre left) with mostly darker stannite, yellow chalcopyrite, and, under UV, sphalerite towards the top left. Ex Minerals Unlimited (old label). Ex...
Formula: CuInS2 From Alfredo Petrov: ROQUESITE (injiumu-dohkoh) Above: Roquesite, Kawazu mine (Rendaiji mine; Rendaizi mine), Rendaiji, Shimoda City, Shizuoka Prefecture, Japan. Width of view 14mm. Tiny metallic patches in quartz.
Formula: (Ca,Na2,K2)[Al2Si4O12]·6H2O From Alfredo Petrov: LEVYNE-Ca (kai-rebi-fusseki) Above: Colourless hexagonal crystals of lévyne-Ca from Kuniga, Nishinoshima, Oki Islands, Okinoshima, Oki District, Shimane Prefecture, Japan. Width of view 3mm. Elsewhere on the specimen lévyne-Ca occurs as yellow iron-stained crystals, white fibrous thomsonite, and tiny analcime crystals. Ex Peter Hall. Ex Hiromi...
