Clay Minerals: Volume 15 -

Swelling minerals in a basalt and its weathering products from Morvern, Scotland: I. Interstratified montmorillonite-vermiculite-illite
D. C. Bain, J. D. Russell
Published online by Cambridge University Press:

09 July 2018, pp. 445-451
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The main clay mineral in weathered basaltic rubble has been shown by X-ray diffraction, chemical, infrared and differential thermal methods to be an interstratification of montmorillonite, vermiculite and illite in the approximate ratio 2:1:1, the montmorillonite having some degree of segregation and the vermiculite and illite being randomly interstratified. All three components are dioctahedral, the swelling ones having a high tetrahedral charge, a large aluminium content, and very little iron. Despite the 50% montmorillonite content of the mineral, its infrared absorption pattern is generally illitic in character.

Clay Minerals