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as revealed by recent infrared fluorescence spectroscopy and is not graphite-rich dolomitic limestone as formerly thought
but you can scratch it with a penny to confirm the identification
incomplete
This peat is silty
muscovite mica from a pegmatite near Coronel Murta, Minas Gerais, Brazil - hand/display specimen as revealed by recent infraredmuscovite 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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