Topotactic Transformation of Muscovite under Mild Hydrothermal Conditions

Cambridge University Press (CUP) - 1963
Alastair W. Nicol1
1The Pennsylvania State University, University Park, Pennsylvania, USA

Tóm tắt

AbstractStudies have been made on muscovite single crystals treated under dry and hydro-thermal conditions at temperatures above 800°C. The course of reaction is markedly affected by the amount of water present in the system. In the presence of a large excess of water, appreciable reaction commences at 800°C with the formation of kalsilite and corundum. The kalsilite may bear an epitaxial relationship to the muscovite, but the corundum is quite unoriented. Reaction appears to proceed by solution of part of the muscovite and reprecipitation on unreacted areas. In the presence of low pressures of water the reaction course appears to be similar to that under dry conditions. Above 900°C a new phase has been identified which is similar to the spinel phase reported by Eberhart at temperatures above 1050°C. The phase is monoclinic and probably represents an intermediate stage between dehydrated muscovite and the spinel phase. A tentative mechanism is proposed for the dehydration of muscovite based on an inhomogeneous mechanism.

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Tài liệu tham khảo

Yoder, 1954, Synthetic and natural muscovites, Geochim et Cosmochim. Acta, 8

Nicol, A. W. (1962) Oriented transformations in the system CaO-SiO2-H2O: Ph.D. Thesis, University of Aberdeen.

Crowley, M. S. (1959) The effect of solid solubility on the synthesis, stability and polytypism of the micas: Ph.D. Thesis, The Pennsylvania State University.

Brindley, 1959, The kaolinite-mullite reaction series, J. Amer. Ceram. Soc., 42

Taylor, 1962, Homogeneous and inhomogeneous mechanisms in the dehydroxylation of minerals, Clay Min. Bull., 5, 45, 10.1180/claymin.1962.005.28.01

Eberhart, 1963b, Etude de la phase type spinelle, Comptes Rendues, 256, 3860

Radoslovich, 1962, The cell dimensions and symmetry of layer- lattice silicates: Part 1, Amer. Miner., 47, 599

Eberhart, 1963a, Etude de la musco vite déshydratée, Comptes Rendues, 256, 3711

Taylor, 1958, Clays and Clay Minerals, 101

Brindley, 1961, The role of crystal structure in the dehydration reactions of some layer-type minerals (In English), J. Min. Soc. Japan, 5, 217

Eberhart, 1962, Etude de cristaux de muscovite deshydratés, Comptes Rendues, 254, 2391

10.1016/0016-7037(63)90065-6

Dent-Glasser, 1962, Topotactic reactions in inorganic oxycompounds, Quart. Revs., 16, 343, 10.1039/qr9621600343

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Cambridge University Press (CUP)

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