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Controlled Synthesis of Heteropolytypic (Mixed-Layer) Clay Minerals

Published online by Cambridge University Press:  01 January 2024

J. T. Iiyama  and
Rustum Roy
J. T. Iiyama
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania, USA
Rustum Roy
Affiliation:
The Pennsylvania State University, University Park, Pennsylvania, USA
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Abstract

The conditions for the formation of various heteropolytypic or mixed-layer phases were determined in a hydrothermal study of synthetic mixtures along the join talc—Na-saponite—Na-phlogopite composition. Heteropolytypes of talc and saponite from compositions between talc and a saponite solid solution and of saponite and a 10 Å sodium mica (Na-phlogopite?) from compositions lying between saponite solid solutions and Na-phlogopite have been prepared reproducibly.

At 1 kb in the temperature range 450-575° C, randomly stacked heteropolytypic phases were formed and persisted. At higher pressures the regular heteropolytypes (regularly interstratified or mixed-layer minerals), generally 1:1 phases, were formed. The genesis of heteropolytypes in nature is discussed on the basis of these results.

Type
Symposium on Bentonites and Texas Uranium Deposits
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 10 , February 1961 , pp. 4 - 22
Copyright
Copyright © Clay Minerals Society 1961

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