metamorphic
Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
Hardness of 2 to 2.5 on the Mohs scale; silvery-white, grey, or tan color with a distinct pearly to metallic luster; foliated crystal structure with excellent basal cleavage, allowing it to easily peel into thin, flexible sheets; specific gravity around 2.7 to 3.0.
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Physical properties
Hardness of 2 to 2.5 on the Mohs scale; silvery-white, grey, or tan color with a distinct pearly to metallic luster; foliated crystal structure with excellent basal cleavage, allowing it to easily peel into thin, flexible sheets; specific gravity around 2.7 to 3.0.
Formation & geological history
Formed through regional metamorphism of argillaceous (clay-rich) sedimentary rocks like shale or mudstone under moderate to high temperatures and pressures.
Uses & applications
Used in industrial applications for electrical insulation, as a filler and extender in paints and plastics, in drywall joint compounds, and occasionally as a decorative stone.
Geological facts
Mica gets its name from the Latin word 'micare', meaning to glitter, due to its highly reflective surface. Schist exhibits a characteristic texture known as 'schistosity', where flaky minerals are visibly aligned in parallel layers.
Field identification & locations
Easily identified in the field by its intensely shiny, reflective, scaly appearance and the ability to flake off thin, flexible sheets of mica. Commonly found in ancient mountain belts and metamorphic core complexes worldwide.
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