Abstract
THE occurrence of the hydrous ferrous silicate, chamosite, in sedimentary ironstones was described by Hallimond1. Later, with Harvey and Bannister2, he concluded that chamosite differed from the iron-bearing chlorites. Brindley3,4 examined chamosites from laterites and other sources, and concluded that they were of kaolin-type. Many of the variations in X-ray diagrams were accounted for by the existence of two kaolin-type structures, one ortho-hexagonal and one monoclinic, with simply related cell dimensions. In common with some other clay minerals, chamosite had random displacements of layers parallel to the b-axis of integral multiples of b/3, giving rise to sharp (hkl) reflexions only for k = 3n. Brindley concluded from the presence of (hkl) reflexions for h ≠ 3n that there were no random a-axis displacements of layers within a single structure, similar to the ‘mistakes’ in the cobalt structure of Wilson5 and Edwards, Lipson and Wilson6. The pure ortho-hexagonal form was found in an iron ore from the main oolitic beds at Corby, Northamptonshire, by Brindley and Youell7.
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References
Hallimond, A. F., Spec. Rep. Min. Res., Mem. Geol. Survey, Great Britain, 29 (1925).
Hallimond, A. F., Harvey, C. O., and Bannister, F. A., Min. Mag., 25, 441 (1939).
Brindley, G. W., Nature, 164, 319 (1949).
Brindley, G. W., Min. Mag., 29, 502 (1951).
Wilson, A. J. C., “X-Ray Optics”, 71 (London, 1949).
Wilson, A. J. C., Lipson, H., and Edwards, O. S., Proc. Roy. Soc., A, 180, 268 (1942).
Brindley, G. W., and Youell, R. F., Min. Mag., 30, 57 (1953).
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YOUELL, R. Mineralogy and Crystal Structure of Chamosite. Nature 176, 560–561 (1955). https://doi.org/10.1038/176560b0
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DOI: https://doi.org/10.1038/176560b0
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