Refinement of the crystal structure of neltnerite, a member of the bixbyite-braunite group of minerals

J. P.R. De Villiers, S. M. Dobson, P. R. Buseck

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The crystal structure of neltnerite CaMn6SiO12 was confirmed by Patterson methods and refined to an R = 0.03 based on 763 observed reflections. The mineral is tetragonal with refined cell constants a = 9.468(1) Å and c = 18.862(2) Å and with space group I41/acd. The structure corresponds closely to that of braunite, with Ca in distorted cubic coordination, Si in tetrahedral coordination, and three Mn atoms in octahedral coordination showing Jahn-Teller distortion. Mean interatomic distances are 2.377 Å for Ca-O; 2.041, 2.066 and 2.046 Å for Mn-O; and 1.621 Å for Si-O. -from Authors

Original languageEnglish (US)
Pages (from-to)567-573
Number of pages7
JournalEuropean Journal of Mineralogy
Volume3
Issue number3
DOIs
StatePublished - Jan 1 1991
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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