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Lemmleinite-K: NaK2(Ti,Nb)2Si4O12(O,OH)2·2(H2O)
Comments: Transparent, pyramidal crystals of lemmleinite-K on matrix. Location: Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag