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Zirkelite: (Ca,Th,Ce)Zr(Ti,Nb)2O7
Comments: Sub-metallic zirkelite crystal aggregate. Location: Jacupiranga Mine, Sao Paulo, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Black, massive aggregate of zirkelite with minor brown biotite and a thin vein of white calcite. Location: Palabora Open Pit mine, Loolekop, Phalaborwa, Limpopo Province, Transvaal, Republic of South Africa. Scale: Picture size 1.5 cm. © Paul M. Schumacher