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Kentbrooksite: (Na,REE)15(Ca,REE)6Mn++Zr3NbSi25O74F2·2(H2O)
Comments: Orange translucent crystals of kentbrooksite frozen in syenite rock. Location: Mount Alluiav, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species