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Nacareniobsite-(Ce): NbNa3Ca3(Ce,La)(Si2O7)2OF3
Comments: White to light brownish nacareniobsite-(Ce) in an igneous rock matrix. Location: Kvanefjeld Tunnel, Ilímaussaq massif, Greenland. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag