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Science 22 April 1966:
Vol. 152. no. 3721, pp. 500 - 502
DOI: 10.1126/science.152.3721.500
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Articles

Rhodizite: Structure and Composition

Martin J. Buerger 1 and Karlheinz Taxer 1

1 Crystallographic Laboratory, Massachusetts Institute of Technology, Cambridge, 02139

The mineral rhodizite could not be assigned a chemical formula on the basis of chemical analyses. The solution of the crystal structure reported here reveals that CsB12Be4Al4O28 is the ideal formula. The oxygen atoms occupy all but four sites per cell of cubic close packing whose period is frac12a. The boron, beryllium, and aluminum atoms occupy interstices of this array, the first two in tetrahedral coordination, the last in octahedral coordination. Together these atoms form a continuous network whose composition is B12Be4Al4O28, which should be neutral. The alkali atom is enclosed in a cage in this network and presumably is not behaving as an ion.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Absence of Neutral Alkali Atoms in Rhodizite.
G. Donnay, G. Donnay, A. N. Thorpe, F. E. Senftle, and R. Sioda (1966)
Science 154, 889-890
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Science. ISSN 0036-8075 (print), 1095-9203 (online)