title: Natural perovskite: (Ca(0.95 (1))Ce(0.011 (2))Na(0.010 (4)))(Fe(0.022 (2))Ti(0.98 (1)))O(3).
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 (Ca(2+) (0.95 (1))Ce(3+) (0.011 (2))Na(+) (0.010 (4)))(Fe(3+) (0.022 (2))Ti(4+) (0.98 (1)))O(2-) (3) and by IR spectroscopy to be an anhydrous mineral. Oxygen anions are arranged around Ti(4+) in an almost perfect octa-hedron and around Ca(2+) in a distorted 12-fold polyhedron.
authors.affiliation: Department of Chemistry, Federal University of Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, Brazil.
authors.forename: Erica G
authors.initials: EG
authors.lastname: Gravina
authors.forename: José D
authors.initials: JD
authors.lastname: Ayala
authors.forename: Nelson G
authors.initials: NG
authors.lastname: Fernandes