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Alkali feldspar is one of the most abundant minerals in the Earth’s crust. It forms a binary solid-solution between the Na and the K end member. Below about 600°C, a miscibility gap opens due to its non-ideal thermodynamic mixing properties. When alkali feldspar with intermediate Na-K composition cools from high temperatures of magmatic or metamorphic ...
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1991
Exsolution, the process by which an initial single-phase solid solution breaks down into a two-phase assemblage, is driven by free-energy minimization and occurs by diffusion. The process may be initiated in various ways, reviewed below, which require, at the start at least, interdiffusion against the concentration gradient.
Ian Parsons, William L. Brown
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Exsolution, the process by which an initial single-phase solid solution breaks down into a two-phase assemblage, is driven by free-energy minimization and occurs by diffusion. The process may be initiated in various ways, reviewed below, which require, at the start at least, interdiffusion against the concentration gradient.
Ian Parsons, William L. Brown
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Thermal Expansion of Alkali Feldspars
1984A change of temperature and composition of a triclinic alkali feldspar is accompanied by displacive and diffusive movements of atoms. Displacive atomic shifts that occur on quenching increase the lattice angles α, γ and [201]∧b (≈ 180° — γ*) via a shear mechanism.
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The Journal of Geology, 1952
In the first part of this paper (1952, pp. 436-450), the structural states of the pure compounds KAlSi3O8 and NaAlSi3O8 have been discussed. This part considers the mixed-crystal series of these compounds and their unmixed states.
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In the first part of this paper (1952, pp. 436-450), the structural states of the pure compounds KAlSi3O8 and NaAlSi3O8 have been discussed. This part considers the mixed-crystal series of these compounds and their unmixed states.
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Alkali Feldspar Exsolution: Kinetics and Dependence on Alkali Interdiffusion
1984The coherent solvus and coherent spinodal for sanidine-high albite are reasonably well known from experimental studies. These relations together with experimental coarsening rates can be used to interpret the thermal histories of rapidly cooled cryptoperthites which are characterized by a coherent, lamellar microstructure.
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Methods for Estimation of Structural State of Alkali Feldspars
2014There is much interest in characterizing the variations in feldspar structures because of the abundance and importance of feldspars in petrologic processes and also due to their general significance in mineralogical studies of exsolution and polymorphism, especially order-disorder.
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Determination of Alkalies in Feldspars
Industrial & Engineering Chemistry Analytical Edition, 1935openaire +1 more source
Does organic acid adsorption affect alkali-feldspar dissolution rates?
Chemical Geology, 1998Eric H Oelkers, Jacques Schott
exaly