Abstract
Stannoidite was found in copper-tin-sulphide ores from xenothermal ore deposits of the four mines mentioned in the title. The mineral assemblages include chalcopyrite, mawsonite, bornite, sphalerite, galena, tennantite-tetrahedrite, cassiterite, and quartz as the common associates. Electron microprobe analyses verified the ideal formula Cu5(Fe, Zn)2SnS8 with minor substi-tution for of copper by silver, and possible deficiency of sulphur leading to Cu5(Fe, Zn)2SnS7. The occurrence of this mineral is rather common in copper-tin sulphide ores from Japanese xenothermal ore deposits.
