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Tienshanite: BaNa2MnTiB2Si6O20 Kupletskite-(Cs): (Cs,K)2Na(Mn,Fe++,Li)7(Ti,Nb)2Si8O26(OH)4F
Comments: Dark olive-green colored crystalline tienshanite with cesium-kupletskite in microcline. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species