Reasons for disagreeing with formulae calculations made by Huff & Turkmenoglu (M.A. 82M/2383) in an investigation of mixed-layer illite/smectite clays are presented and discussed. The use of 'rectorite-like' and 'allevardite-like' for I/S or I/M ordered interlayering is criticized.-D.F.B.
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Chemical characteristics and origin of Ordovician K-bentonites along the Cincinnati Arch: a discussion.