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X-ray diffraction experiments on illite and bravaisite

Published online by Cambridge University Press:  14 March 2018

G. Nagelschmidt
G. Nagelschmidt*
Affiliation:
Chemistry Department, Rothamsted Experimental Station, Harpenden
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Extract

Unpublished work carried out in this laboratory several years ago had shown that the first-order basal X-ray reflections of illite from South Wales occurred at a spacing of about 10Å both with potassium- and calcium-saturated samples. Recently Jackson and others observed that hydrated mica samples having a 10Å basal spacing when saturated with potassium, showed a 12 to 13Å. spacing after saturation with calcium. They interpreted their results by ascribing to illite a limited capacity for reversible lattice shrinkage and expansion, identical in type with that known for montmorillonite.

In order to study the problem further three illite and two glauconite samples were treated with concentrated calcium chloride solutions for five weeks under frequent renewal of the solution.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 27 , Issue 187 , December 1944 , pp. 59 - 61
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1944

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References

page 59 note 1 Nagelschmidt, G. and Hicks, D., Min. Mag., 1943, vol. 26, pp. 297–303.CrossRefGoogle Scholar

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page 61 note 2 Fleischer, M., Amer. Min., 1943, vol. 28, p. 470.Google Scholar