Abstract
IT is well known that large, well-crystallized sheets of muscovite mica are resistant to thermal decomposition at temperatures above 500° C. Hidnert and Dickson1, for example, reported that heating at 600° C for 1 h produced little or no change in the properties of a large number of different muscovite samples. Finely divided muscovite, however, begins to lose its structural water at an appreciable rate at temperatures as low as 400° C (ref. 2). Related dioctahedral aluminosilicates, such as the montmorillonite clays, are also dehydroxylated at temperatures below 500° C (ref. 3). This process occurs without a general destruction of the crystal lattice in dioctahedral minerals. It has been recognized4 that the rate of decomposition may be limited by diffusion of water from the lattice.
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References
Hidnert, P., and Dickson, G., J. Res. U.S. Nat. Bur. Stand., 35, 309 (1945).
Roy, R., J. Amer. Ceram. Soc., 32, 202 (1949).
Grim, R. E., Clay Mineralogy, 220 (McGraw-Hill, New York, 1953).
Sabatier, G., J. de Chim. Phys., 52, 60 (1955).
DeVries, R. C., and Roy, R., Econ. Geol., 53, 958 (1958).
Gaines, jun., G. L., J. Phys. Chem., 61, 1408 (1957).
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GAINES, G., VEDDER, W. Dehydroxylation of Muscovite. Nature 201, 495 (1964). https://doi.org/10.1038/201495a0
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DOI: https://doi.org/10.1038/201495a0
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