Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2016 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R1-P11
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Host: Japan Association of Mineralogical Sciences

R1: Characterization and description of minerals
Xonotlite from the Yatani mine, Yamagata Prefecture, Japan
*Yuya Izumino, Kazuo Nakashima, Hyakuzo Usui
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Keywords: xonotlite, Ca-sillicate, Yatani mine, epithermal Au-Ag deposit, hydrothermal fluid
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Abstract
Xonotlite have been found in the Yatani mine, Yagamata Prefecture, Japan. Samples bearing xonotlite
were collected in the Higashi Tengu No. 2 vein. This mineral shows white massive aggregate, composed of fine fibrous crystals less than 200 μm, and coexists with johannsenite, calcite and quartz. The XRD pattern of the mineral corresponds to xonotlite of PDF 23-0125. The empirical
formula of xonotlite obtained by WDS is (Ca5.91Mn0.06)Σ5.97Si6.03O17(OH)2 (O = 19, OH = 2apfu).
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© 2016 Japan Association of Mineralogical Sciences
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