Japanese Magazine of Mineralogical and Petrological Sciences
Online ISSN : 1349-7979
Print ISSN : 1345-630X
ISSN-L : 1345-630X
Short Note
Bismuth minerals from the Fukueison mine, Yamagata Prefecture, Japan
Yuya IZUMINOKazuo NAKASHIMA
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2015 Volume 44 Issue 4 Pages 205-209

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Abstract

  Bi minerals have been discovered from the Fukueison mine, situated in the Uetsu region, Tsuruoka City, Yamagata Prefecture, Japan. Bi minerals occur in quartz veins which consist of chalcopyrite, pyrite and chlorite, accompanied by minor molybdenite, sphalerite and arsenopyrite, hosted in the Nishitagawa granodiorite. Bi minerals are composed of bismuthinite as a major constituent and native Bi, Bi-sulfosalts (krupkaite, cosalite and galenobismutite) and Bi-Te-S minerals (tetradymite, joséite-A, joséite-B and ingodite) as minor constituents. From the paragenesis and texture of Bi minerals, these minerals might have been formed by a change of fS2 and fTe2 conditions. Comparing to other Bi-bearing Mo deposits, Inner Zone of Southwest Japan, it is considered that Bi is closely related with Cu mineralization.

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© 2015 Japan Association of Mineralogical Sciences
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