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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R1: Characterization and description of minerals
Gratianite in manganese ore from the Hagidaira mine, Gumma Prefecture, Japan
*Satoshi MatsubaraRitsuro MiyawakiKoichi MommaAkira KatoMasako ShigeokaMasaaki ShimizuYoshinori KyonoYoshihiro OharaAkira Harada
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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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