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Cesstibtantite: (Cs,Na)SbTa4O12
Comments: Flesh-coloured simpsonite (blue scheelite-like UV luminescention) crystal partially replaced with grey cesstibtantite (orange UV luminescention).. Location: Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Specimen size is 6x5x2 cm. © Pavel M. Kartashov