metamorphic
Mica Schist
Metamorphic rock dominated by micas (muscovite, biotite)
AI-generated identification · may be incorrectHardness varies between 2 and 4 depending on mineral content; gray, silver, or brownish color; pearly to metallic luster due to abundant platy minerals; foliated texture with visible mineral grains showing schistosity; specific gravity around 2.7-3.0.
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Physical properties
Hardness varies between 2 and 4 depending on mineral content; gray, silver, or brownish color; pearly to metallic luster due to abundant platy minerals; foliated texture with visible mineral grains showing schistosity; specific gravity around 2.7-3.0.
Formation & geological history
Formed through regional metamorphism of argillaceous rocks like shale or pelitic mudstone under medium-to-high temperatures and pressures, typically during mountain-building events (orogenies) over millions of years.
Uses & applications
Used primarily as decorative stone, in landscaping, and occasionally as a source of mica flakes for industrial applications, insulation, and paint fillers.
Geological facts
Schist represents an intermediate grade of metamorphism, lying between slate and gneiss. The glistening appearance on the cleavage surfaces is caused by tiny, aligned mica crystals reflecting light.
Field identification & locations
Easily identified in the field by its distinct foliation (schistosity), visible sparkly mica flakes along cleavage planes, and wavy, layered appearance. Commonly found in mountainous regions and shields worldwide.
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