metamorphic
Mica Schist
Metamorphic rock predominantly composed of muscovite or biotite with quartz and feldspar
Hardness varies around 3 to 4 on the Mohs scale, color ranges from silvery-gray to greenish or brownish, exhibits a prominent shiny or pearly luster due to abundant mica flakes, foliated crystal structure with visible planar alignment (schistosity), good cleavage along foliation planes, specific gravity around 2.7 to 3…
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Physical properties
Hardness varies around 3 to 4 on the Mohs scale, color ranges from silvery-gray to greenish or brownish, exhibits a prominent shiny or pearly luster due to abundant mica flakes, foliated crystal structure with visible planar alignment (schistosity), good cleavage along foliation planes, specific gravity around 2.7 to 3.0
Formation & geological history
Formed by regional metamorphism of argillaceous rocks such as shales and mudstones, or sometimes fine-grained igneous rocks, subjected to high temperatures and pressures over millions of years
Uses & applications
Used primarily in landscaping, decorative stone, and historically as a source of mica for insulation; also studied extensively in geology for understanding tectonic processes
Geological facts
Schist represents an intermediate grade of metamorphism, lying between slate and gneiss. Its characteristic sparkle comes from millions of tiny reflective mica crystals aligned parallel to one another.
Field identification & locations
Easily identified in the field by its distinct foliation and sparkling, glittering appearance caused by weathered mica flakes. Found worldwide in mountain-building belts and ancient cratons
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