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Mica
group of phyllosilicate minerals / From Wikipedia, the free encyclopedia
The mica group of minerals are aluminosilicates with various metals. They split into fine sheets, which puts them in the phyllosilicate group of silicate minerals.
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Mica includes several closely related materials having perfect basal cleavage.
All are monoclinic which means their crystals are shaped like one kind of prism. They tend towards pseudo-hexagonal crystals and are similar in chemical composition. The highly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.
Being excellent electrical insulators, they are used in electronic equipment including capacitors.