Acta Crystallographica Section E (Sep 2008)
Natural perovskite: (CaII0.95 (1)CeIII0.011 (2)NaI0.010 (4))(FeIII0.022 (2)TiIV0.98 (1))O3
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))O2−3 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.