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Tsepinite-Sr: (Sr,Ba,K)(Ti,Nb)2(Si4O12)(OH,O)2·3(H2O)
Comments: BSE image of crystals of tsepinite-Sr with Ba-enriched (light parts) margin zones. (New Data on Minerals. M., 2005. Vol. 40). Location: Mt. Eveslogchorr, Khibiny. Russia.. Scale: See Image. © New Data on Minerals