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Muscovite Pegmatite

Chemical Process (Liquid-phase Growth) - Closed system under ground (Melt precipitation)




Muscovite class < Granitic pegmatite

Required Geological Setting

Middle-pressure metamorphic rocks


Pegmatite associated with lower Amphibolite facies in Barrovian-type middle-P metamorphism. Formation condition is 580-650 degree and 0.5-0.8 GPa (12-30 km depth). Pegmatites are observed as a part of S-type granites formed by partial melting or re-crystallization of sedimentary rocks. Pegmatites are usually concordant with schistose textures of host metamorphic rocks subjected to Amphibolite facies metamorphism. Pegmatites are massive and pockets are very rare. Mineral assemblages is very simple, and is composed of feldspar, quartz, muscovite, and few accessory minerals.

Mineral Assemblages

Quartz, Microcline, Albite, Muscovite, Biotite, Almandine, Spessartine, (Kyanite, Sillimanite)

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