metamorphic
Mica Schist or Muscovite
KAl2(AlSi3O10)(OH)2
Hardness of 2 to 2.5 on the Mohs scale, silvery-white or golden color with a pearly to metallic luster, foliated crystal structure with perfect basal cleavage allowing it to split into thin elastic sheets, specific gravity of 2.7 to 3.1.
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Physical properties
Hardness of 2 to 2.5 on the Mohs scale, silvery-white or golden color with a pearly to metallic luster, foliated crystal structure with perfect basal cleavage allowing it to split into thin elastic sheets, specific gravity of 2.7 to 3.1.
Formation & geological history
Formed through regional metamorphism of argillaceous sediments such as shales and mudstones under high temperature and pressure conditions, dating back across various geological eras.
Uses & applications
Used in electrical insulation, paints, cosmetics, drywall joint compounds, and as a filler in plastics and rubber due to its heat-resistant and insulating properties.
Geological facts
Mica minerals are well known for their ability to cleave into extremely thin, flexible, and transparent sheets, historically used as window glass in stoves and lanterns.
Field identification & locations
Easily identifiable in the field by its glittering, flaky appearance and ability to be easily scratched with a fingernail. Commonly found in metamorphic terrain worldwide.
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