metamorphic
Mica Schist with Biotite or Muscovite
Metamorphic rock rich in sheet silicates
Hardness: 2-2.5 for the mica flakes, 6-7 for quartz inclusions. Color: Silvery-gray, brown, or purplish due to lighting and iron staining. Luster: Highly reflective, pearly to metallic. Crystal structure: Monoclinic (for mica). Cleavage: Perfect basal cleavage in micas, splitting into thin, flexible sheets.…
- Hardness
- 2-2
- Luster
- Highly reflective, pearly to metallic
Identified More metamorphic →
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Physical properties
Hardness: 2-2.5 for the mica flakes, 6-7 for quartz inclusions. Color: Silvery-gray, brown, or purplish due to lighting and iron staining. Luster: Highly reflective, pearly to metallic. Crystal structure: Monoclinic (for mica). Cleavage: Perfect basal cleavage in micas, splitting into thin, flexible sheets. Specific gravity: 2.7-3.0.
Formation & geological history
Formed through regional metamorphism of argillaceous (clay- and silt-rich) sedimentary rocks like shale or mudstone under high temperature and pressure, typically during mountain-building events over millions of years.
Uses & applications
Used in construction aggregates, drywall texture, electrical insulation, cosmetics, and as ornamental stone or collector specimens.
Geological facts
Mica schist is famous for its glittering appearance caused by millions of tiny, aligned mica flakes reflecting light. It often contains accessory minerals like garnet, staurolite, and kyanite.
Field identification & locations
Easily identified in the field by its distinct foliation (schistosity) and the abundant, visible shiny flakes of mica covering its surface. Found worldwide in metamorphic mountain belts.
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