Micas: Crystal Chemistry and Metamorphic Petrology (Reviews by Annibale Mottana, Francesco Paolo Sassi, James B., Jr.

By Annibale Mottana, Francesco Paolo Sassi, James B., Jr. Thompson, Stephen Guggenheim

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Extra info for Micas: Crystal Chemistry and Metamorphic Petrology (Reviews in Mineralogy and Geochemistry Series, Volume 46)

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1993), is related to the temperature during mica growth. ATOMISTIC MODELS INVOLVING HIGH-TEMPERATURE STUDIES OF THE MICAS Studies of samples having undergone heat treatment Where a transformation occurs in the solid state and the rearrangement of the atoms in the product is limited relative to the reactant, the use of Pauling’s electrostatic valency principle may delineate the transformation process in detail. , Guggenheim et al. 1987 for muscovite). This procedure follows a transformation step-by-step and describes how bond lengths and bond strengths are affected at each transitional step.

The octahedral sheet may show different cation distributions in M(1), M(2), and M(3), but the size of each octahedron need not differ. For example, the zinnwaldite-1M (polylithionite-siderophyllite intermediate) structure refined by Guggenheim and Bailey (1977) shows M(1) ≠ M(2) ≠ M(3) on the basis of the site scattering power, whereas M(1) = M(3) ≠ M(2) on the basis of size of the polyhedra. Verification of ordering requires not only the analysis of cation-anion bond length but also the refinement of octahedral-site occupancies because mean bond lengths of octahedra with different occupancies may be similar.

In the latter case, perhaps, the presence of monovalent and trivalent octahedral cations requires ordering of the tetrahedral cations to achieve a suitable local charge balance on shared apical oxygen atoms. The possibility of tetrahedral cation ordering in kinoshitalite, characterized by a Si:Al ratio close to 1, was addressed by Guggenheim and Kato (1984), Guggenheim (1984), and Gnos and Armbruster (2000). 328 Å; Guggenheim and Kato 1984) caused by the large Ba interlayer cation which increases the separation between adjacent 2:1 layers, thus reducing any T–T electrostatic interactions across the interlayer.

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