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Grechishchevite: Hg3S2(Br,Cl,I)2
Comments: Red grechishchevite coatings on calcite. Location: Kadyrel' Hg occurrence, Oorash-Khem River Valley, Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Picture Size 2 mm. © Jeff Weissman / Photographic Guide to Mineral Species