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Science 21 June 1968:
Vol. 160. no. 3834, pp. 1338 - 1340
DOI: 10.1126/science.160.3834.1338
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Articles

Zinnwaldite: Octahedral Ordering in Lithium-Iron Micas

Milan Rieder 1

1 Department of Geology, Johns Hopkins University, Baltimore, Maryland 21218

Ordering of the octahedral sheet of some lithium-iron micas is proposed on the basis of chemical compositions and crystallographic properties. The model of the ordered sheet has large and small sites in the ratio 2 : 1 and explains all observed properties— the small layer thickness, the "dioctahedral reflections," and the n(120 deg) motif in polytypism.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)