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Korobitsynite: Na3(Ti,Nb)2[Si4O12](OH,O)2·3-4(H2O)
Comments: Colorless prismatic crystals of korobitsynite. Location: Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag