Margarite, paragonite, and muscovite occur together in graphitic metapelites near Georgetown, California. Most of the margarite occurs as a pseudomorphic replacement of coarsegrained chiastolite, whereas muscovite and paragonite are largely confined to the ground-mass. Microprobe analyses of the three white micas provide further information about the margarite + paragonite + muscovite three-phase field in the system Al2O3-Na2O-K2O-CaO-SiO2-H2O.

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