Bismuth minerals from Ishidera, Wazuka, Kyoto Prefecture, Japan

Abstract

Bi-minerals were discovered from quartz veins in the Ishidera area, Wazuka, Kyoto Prefecture, Japan. Native bismuth occurs with a rim consisted of bismite, bismoclite-daubreeite, and bismutite. Yellow veins also occur near the native bismuth. The XRD pattern corresponds to russellite; however, EPMA analysis shows that the ratio of Bi:W is 3:1. In TEM analysis, the russellite-like mineral is susceptible to electron beam, and hexagonal platy crystals 10 nm in diameter are formed and grown.