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Lucasite-(Ce): CeTi2(O,OH)6
Comments: B&W image of a striated, euhedral lucasite-(Ce) crystal showing {001} and {101} faces. The dark substrate is calcite. (AmMin, v72:1006). Location: Heavy-mineral concentrate derived from an olivine lamproite tuff at Argyle, in the east Kimberley region of Western Australia. Scale: See Image. © American Mineralogist