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Arapovite: (U,Th)(Ca,Na)2(K1-x[ ]x)Si8O20·H2O, x=0.5
Comments: Dark green prismatic arapovite crystals with rectangular shapes. Location: Dara-i-Pioz Glacier, Hait, Alayskiy (Alai) Range, Tien Shan Mountains, Tajikistan. Scale: See Image. © Rruff Database