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Tsepinite-Ca: (Ca,K,Na,[ ])2(Ti,Nb)2(Si4O12)(OH,O)2·4(H2O)
Comments: Groups of tan colored parallel prismatic tsepinitie-Ca crystals associated with eudialyte and arfvedsonite. Location: Hackmann Valley, Yukspor Mountain, Khibiny, Kola, Russia. Scale: See Image. © Rruff Database