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which means you can't scratch it with a fingernail
roughly half/half
The first volumes were published by Fritz Lehmann in Stuttgart
It is also used as a filler in rubber and in paper
muscovite mica from a pegmatite near Coronel Murta, Minas Gerais, Brazil - display specimen which means you can't scratchmuscovite 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
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