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Vuoriyarvite-K: (K,Na)2(Nb,Ti)2Si4O12(O,OH)2·4(H2O)
Comments: Light tan, compact mass of vuoryarvite-K micro-crystals associated with calcite and greenish sodalite. Location: Vein No. 46, Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database