metamorphic
Mica schist
Schist (rich in Muscovite or Biotite mica)
Hardness varies from 2 to 4 on the Mohs scale depending on mineral content. Features a highly lustrous, flaky appearance with a silvery-gold or bronze color due to abundant mica flakes. Foliated crystal structure with visible planar alignment of platy minerals, perfect basal cleavage, and specific gravity around 2.7-3.…
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Physical properties
Hardness varies from 2 to 4 on the Mohs scale depending on mineral content. Features a highly lustrous, flaky appearance with a silvery-gold or bronze color due to abundant mica flakes. Foliated crystal structure with visible planar alignment of platy minerals, perfect basal cleavage, and specific gravity around 2.7-3.0.
Formation & geological history
Formed by regional metamorphism of argillaceous rocks such as shales and mudstones, subjected to high temperatures and pressures deep within the Earth's crust over millions of years.
Uses & applications
Primarily used as a decorative stone, in landscaping, and occasionally as a building facade material. Mica extracted from related rocks is used in electronics and cosmetics.
Geological facts
The shimmering appearance is caused by the reflection of light off millions of tiny, parallel-aligned mica crystals. Schist represents an intermediate grade of metamorphism, sitting between slate and gneiss.
Field identification & locations
Easily identified in the field by its distinct foliation (schistosity) and the glittering, flaky surfaces of mica. Commonly found in mountain-building belts and ancient shield areas worldwide.
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