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Nechelyustovite: (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}·4.5H2O
Comments: Nechelyustovite aggregate. Location: Kirovsky Mine, Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Russia. Scale: Grid Size 1 mm. © Sergey Vasiliev / Systematic Mineralogy