Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2018 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R1-09
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Host: Japan Association of Mineralogical Sciences

R1: Characterization and description of minerals
Gratianite in manganese ore from the Hagidaira mine, Gumma Prefecture, Japan
*Satoshi Matsubara, Ritsuro Miyawaki, Koichi Momma, Akira Kato, Masako Shigeoka, Masaaki Shimizu, Yoshinori Kyono, Yoshihiro Ohara, Akira Harada
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Keywords: gratianite, Hagidaira mine, manganese ore
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Abstract
Gratianite occurs as irregular aggregates up to 1 mm in rhodonite-rhodochrosite-quartz ore from the Hagidaira mine, Gumma Prefecture, Japan. It is in association with cosalite, bismuth and ingodite. Gratianite was examined by Gandolfi camera and electron probe microanalyzer (WDS).The empirical formula of gratianite is (Mn0.794Fe0.187Pb0.025)1.006(Bi1.974Sb0.027)2.001(S3.990Se0.003)3.993. The unit cell parameters are a= 12.7123(10), b= 3.91348(12), c= 14.7749(10) A and beta= 115.310(6)°.
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© 2018 Japan Association of Mineralogical Sciences
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Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists

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