A wide range of structural states is displayed by alkali feldspars in Precambrian high-grade metamorphic rocks from central Australia. Orthoclase is present in granulite facies and transitional granulite to amphibolite facies rocks, and microcline occurs in amphibolite facies gneisses. The inversion of monoclinic to triclinic symmetry occurred during amphibolite facies metamorphic conditions. The minimum exsolution temperature in the alkali feldspars from the transitional and granulite facies is approximately 560°C.

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