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were mobilized either by magmatic or metamorphic processes in the underlying crystalline rocks or by the compaction of Triassic platform carbonates
roughly half/half
Often they are completely mineral-filled
during the Late Triassic according to one model
medium and longwave u/v: https://www
muscovite mica from a pegmatite near Coronel Murta, Minas Gerais, Brazil - display specimen were mobilized either by magmaticmuscovite mica KAL3Si3O10(OH)2 Coronel Murta, Minas Gerais, Brazil Muscovite is a common rock forming mineral. In pegmatites, which are essentially giant crystal granitic rocks, muscovite forms large books and can be cleaved into large sheets. It is mined commercially for use as an insulator in transformers and electrical equipment. Scrap muscovite, small flakes, is used as a filler or extender in paints. Transparent in thin sheets, muscovite is
US$ 1848.31
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US$ 168.00
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