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Clay minerals and bauxitic minerals. A review and classification based on a statistical method

Published online by Cambridge University Press:  14 March 2018

S. I. Tomkeieff
S. I. Tomkeieff*
Affiliation:
Armstrong College, University of Durham, Newcastle-on-Tyne
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Summary

A statistical study of clay and bauxitic minerals, which consisted of plotting all available analyses of these minerals on two triangular diagrams (figs. 1 and 7) and constructing frequency curves for the cardinal ratios, led to a classification of these minerals on a purely chemical basis. The suggestion is also made that among substances claimed to be minerals we can select only a few as belonging to definite mineral species, and that the others are probably mixtures of these selected minerals, or their hydration products, or colloidal hydrates of variable composition. The distinct crystalline mineral species thus singled out are as follows :

Besides these minerals, other substances, such as termierite, anauxite, allophane, &c., are suggested as probable species, without, however, any clear statistical evidence. The bentonitic minerals, not belonging strictly to the pure hydrous aluminium silicates, are placed in a separate group.

In conclusion, I should like to thank Dr. G. Hickling and Mr. G. S. Mockler for reading the MS. of this paper and for their valuable suggestions.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 23 , Issue 143 , December 1933 , pp. 463 - 482
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1933

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