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Gjerdingenite-Ca: K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O
Comments: Tiny brown fragment of gjerdingenite-Ca. Location: Pegmatite No. 61, Karnasurt Mt, Lovozero Massif, Kola Peninsula, Russia. Scale: Not Given. © Sergey Vasiliev / Systematic Mineralogy