metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
Hardness: 2-3 (Mohs scale for mica), Color: Silvery-grey to bronze-gold, Luster: Pearly to metallic, Crystal Structure: Monoclinic (platy flake structure), Cleavage: Perfect basal cleavage.
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Physical properties
Hardness: 2-3 (Mohs scale for mica), Color: Silvery-grey to bronze-gold, Luster: Pearly to metallic, Crystal Structure: Monoclinic (platy flake structure), Cleavage: Perfect basal cleavage.
Formation & geological history
Formed via regional metamorphism of clay-rich sedimentary rocks like shale under intermediate pressure and temperature conditions. Typically found in mountain belts and Precambrian shields.
Uses & applications
Used as an insulating material in electrical components due to heat resistance, in construction for decorative stones, and as a filler in paints and plastics.
Geological facts
The word 'schist' is derived from the Greek 'schizein' meaning 'to split', referring to its ability to flake easily along planes of mica. It often contains garnets.
Field identification & locations
Identified by its 'schistosity' or foliated, glittery texture. It sparkles in sunlight. Found in riverbeds or mountain outcroppings. Collectors should look for garnets embedded in the mica layers.
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