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Paravinogradovite: (Na,[ ])2(Ti,Fe+++)4(Si2O6)2(Si3AlO10)(OH)4·H2O
Comments: Aggregates of parallel tan colored acicular paravinogradovite crystals associated with zircon. Location: Kukisvumchorr Mountain, Khibiny Massif, Kola Peninsula, Russia. Scale: See Image. © Rruff Database