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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.

References

Buerger, M.J., and Taxer, K.J. (1966) Science. 152, 500-2.CrossRefGoogle Scholar
Cowley, J.M., and Moodie, A.F. (1957) Ada Crystallogr. 10, 609-19.CrossRefGoogle Scholar
Damour, A. (1882) Bull. Soc. Mineral. Fr. 5, 98-103.Google Scholar
Din, V.K., and Jones, G.C. (1978) Chem. Geol. 23, 347-52.CrossRefGoogle Scholar
Donnay, G., Thorpe, A.N., Senftle, F.E., and Sioda, R. (1966) Science. 154, 889-90.CrossRefGoogle Scholar
Doyle, P.A., and Turner, P.S. (1968) Ada Crystallogr. A24, 390-7.CrossRefGoogle Scholar
Duparc, L., Wunder, M., and Sabot, R. (1911) Bull. Soc.fr. Mineral. 34, 131-9.Google Scholar
Frondel, C, and Ito, J. (1965) Tschermaks Mineral. Petrogr. Mitt. 10, 409-12.CrossRefGoogle Scholar
Fyfe, C.A. and others (1982) Phil. Trans. R. Soc. London, A305, 591-607.Google Scholar
Fyfe, C.A.and others (1983) In Inorganic Chemistry: Towards the 21st Century.Am. Chem. Soc. 405-30.Google Scholar
Gatehouse, B.M., and Pring, A. (1981) J. Solid State Chem. 38, 116-20.CrossRefGoogle Scholar
Goodman, P., and Moodie, A.F. (1974) Ada Crystallogr. A30, 280-90.CrossRefGoogle Scholar
Lacroix, A.F.A. (1910) Bull. Soc.fr. Mineral. 33, 37-53..Google Scholar
Lacroix, A.F.A. (1922) Mineralogie de Madagasca. 1, 340-42.Google Scholar
Pring, A., Jefferson, D.A. and Thomas, J.M. (1983) J. Chem. Soc, Chem. Comm.734-6.CrossRefGoogle Scholar
Rose, G. (1834) Annln. Phys. Chem. 33, 253-6..CrossRefGoogle Scholar
Rose, G. (1836. Ibid. 39, 321-3.CrossRefGoogle Scholar
Scherzer, O. (1949) J. Applied Physics. 20, 20-9.CrossRefGoogle Scholar
Shannon, R.D. (1976) Ada Crystallogr. A32, 751-67.CrossRefGoogle Scholar
Smith, D.J. Saxton, W.O., O'Keefe, M.A., Wood, G.J., and Stobbs, W.M. (1983) Ultramicroscopy. 11, 263-82.CrossRefGoogle Scholar
Smith, K.A., Kirkpatrick, R.J., Oldfield, E., and Henderson, D.M. (1983) Am. Mineral. 68, 1206-15.Google Scholar
Strunz, H. (1938) Naturwiss. 26, 217..CrossRefGoogle Scholar
Strunz, H. (1943. Ibid. 31, 68.CrossRefGoogle Scholar
Taxer, K.J., and Buerger, M.J. (1967) Z. Kristallogr. 125, 423-36.CrossRefGoogle Scholar