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Manganbelyankinite: (Mn,Ca)(Ti,Nb)5O12·9(H2O)
Comments: Brownish to blackish manganbelyankinite coatings on syenite rock. Location: Punkurvaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species