Redetermination of ruizite,Ca2Mn3+2[Si4O11(OH)2](OH)2.2H2O

Kim V. Fendrich, Robert T Downs, Marcus J. Origlieri

Research output: Contribution to journalArticle

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Abstract

The crystal structure of ruizite, ideally Ca2Mn3+2[Si4O11(OH)2](OH)2.2H2O [dicalcium dimanganese(III) tetrasilicate tetrahydroxide dihydrate] was first determined in space group A2 with an isotropic displacement parameter model (R = 5.6%) [Hawthorne (1984). Tschermaks Mineral. Petrogr. Mitt. 33, 135-146]. A subsequent refinement in space group C2/m with anisotropic displacement parameters for non-H atoms converged with R = 8.4% [Moore et al. (1985). Am. Mineral. 70, 171-181]. The current study reports a redetermination of the ruizite structure by means of single-crystal X-ray diffraction data of a natural sample from the Wessels mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Our data (R1 = 3.0%) confirm that the space group of ruizite is that of the first study rather than C2/m. This work improves upon the structure reported by Hawthorne (1984) in that all non-H atoms were refined with anisotropic displacement parameters and all hydrogen atoms were located. The crystal structure consists of [010] chains of edge-sharing MnO6 octahedra flanked by finite [Si4O11(OH)2] chains. The Ca2+ cations are situated in the cavities of this arrangement and exhibit a coordination number of seven.

Original languageEnglish (US)
Pages (from-to)959-963
Number of pages5
JournalActa Crystallographica Section E: Crystallographic Communications
Volume72
DOIs
StatePublished - 2016

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Atoms
Minerals
Manganese mines
Crystal structure
minerals
crystal structure
Republic of South Africa
coordination number
atoms
Cations
manganese
Hydrogen
hydrogen atoms
Positive ions
Single crystals
cations
X ray diffraction
cavities
single crystals
diffraction

Keywords

  • Crystal structure
  • Finite silicate chain
  • Redetermination
  • Ruizite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Redetermination of ruizite,Ca2Mn3+2[Si4O11(OH)2](OH)2.2H2O. / Fendrich, Kim V.; Downs, Robert T; Origlieri, Marcus J.

In: Acta Crystallographica Section E: Crystallographic Communications, Vol. 72, 2016, p. 959-963.

Research output: Contribution to journalArticle

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