Location of Repository

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

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

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

Topics: crystal structure, redetermination, ruizite, finite silicate chain, Chemistry, QD1-999
Publisher: International Union of Crystallography
Year: 2016
DOI identifier: 10.1107/S2056989016009129
OAI identifier: oai:doaj.org/article:11085c542afd4967a6c024c0374970fb
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/2056-9890 (external link)
  • http://scripts.iucr.org/cgi-bi... (external link)
  • https://doaj.org/article/11085... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.