Baddeleyite, Zircon

Locality: Poços de Caldas, Poços de Caldas plateau, Minas Gerais, Brazil

Greenish-grey fibrous Baddeleyite associated in this specimen with grey granular Zircon (right side of the pebble). Zircon-favas - water-washed pebble of Caldasite. Caldasite is collomorphous metacolloidal variety of Baddeleyite, formed in laterite crusts of weathering of nepheline syenites and phonolites. Zircon-favas is result of rewashing of these crusts by modern rivers. Specimen size is 2x1.5x1.5 cm and its weight is 23,6 g, so its specific gravity is 5.24 g/cm3. Ex-collection of Fedor V. Chukhrov obtained by him 14 August 1982. Pavel M. Kartashov collection and photo.

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Photo added: 8th Oct 2008

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