Mineral: Calcite
Locality: Dachang District, Nandan, Hechi Prefecture, Guangxi Zhuang Autonomous Region, China
Dimensions: 4.6 x 4.9 cm
Description: A colorless low angle rhomb of calcite with a narrow strip of included pyrite bisecting each of the three terminal faces. There is a very good article explaining how these form in the Mar/Apr 2015 issue of Rocks and Minerals authored by none other than FMF member Peter Richards.
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