Acta Cryst. (2008). E64, i65  [ doi:10.1107/S1600536808026421 ]

Natural perovskite: (Ca^II_0.95 (1)Ce^III_0.011 (2)Na^I_0.010 (4))(Fe^III_0.022 (2)Ti^IV_0.98 (1))O₃

É. G. Gravina, J. D. Ayala and N. G. Fernandes

Abstract: A natural sample of perovskite (calcium caesium sodium iron titanium oxide) from the Tapira Alkaline Complex in southeastern Brazil was found by electron microprobe analysis to have the chemical formula (Ca²⁺_0.95 (1)Ce³⁺_0.011 (2)Na⁺_0.010 (4))(Fe³⁺_0.022 (2)Ti⁴⁺_0.98 (1))O^2-₃ and by IR spectroscopy to be an anhydrous mineral. Oxygen anions are arranged around Ti⁴⁺ in an almost perfect octahedron and around Ca²⁺ in a distorted 12-fold polyhedron.

Online 30 August 2008

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