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The crystal chemistry of rhodizite: a re-examination

Published online by Cambridge University Press:  05 July 2018

A. Pring ,
V. K. Din ,
D. A. Jefferson  and
J. M. Thomas
A. Pring
Affiliation:
Department of Physical Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EP
V. K. Din
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
D. A. Jefferson
Affiliation:
Department of Physical Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EP
J. M. Thomas
Affiliation:
Department of Physical Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EP
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Abstract

The crystal chemistry of rhodizite was re-examined using data from high-resolution electron microscopy (HREM), magic angle spinning nuclear magnetic resonance (MASNMR), a single crystal X-ray structure refinement, and a new chemical analysis. The analysis calculates to the formula: (K0.46Cs0.36Rb0.06 Na0.02)Σ0.90Al3.99Be4(B11·35Be0.55Li0.02)O28· The distribution of alkali cations was shown to be truly random by HREM images and computer image simulations. The distribution of boron and beryllium was monitored by MASNMR, the spectra for both elements gave only single resonances indicating that all beryllium and boron atoms are located in chemically equivalent sites. The structure of rhodizite was refined by single crystal X-ray diffraction techniques. The mineral is cubic a = 7.318(1) Å, space group P3m. A full matrix least-squares refinement using 152 unique observed reflections [F > 3σ(F)] converged to R = 0.0344. The refinement confirmed the basic structure as determined by Taxer and Buerger (1967), 4 beryllium atoms of the unit cell were found to occupy a 4e special position, the remaining 0.5 being randomly distributed with the 11.35 boron atoms over the 12h sites.

Keywords

rhodizitecrystal chemistryhigh-resolution electron microscopymagic angle spinning nuclear magnetic resonance
Type
Crystal Structures
Information
Mineralogical Magazine , Volume 50 , Issue 355 , March 1986 , pp. 163 - 172
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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Footnotes

*

Present address: South Australian Museum, North Terrace, Adelaide, South Australia, 5000.

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