metamorphic
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
Hardness 3.5 to 5 on Mohs scale; silver-gray to bronze brown with strong pearly or metallic luster; foliated schistose texture rich in reflective flakes; perfect basal cleavage in mica components.
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Physical properties
Hardness 3.5 to 5 on Mohs scale; silver-gray to bronze brown with strong pearly or metallic luster; foliated schistose texture rich in reflective flakes; perfect basal cleavage in mica components.
Formation & geological history
Formed through medium-grade regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under intense heat and directional pressure deep within continental collision zones.
Uses & applications
Mainly used as decorative stone, dimension stone in architecture, landscaping, and as educational rock specimens.
Geological facts
The sparkling effect is created by aligned mica crystals (muscovite or biotite) catching light simultaneously. Over long exposure, schist can weather into clay-rich soil enriched with mica flakes.
Field identification & locations
Look for visible alignment of sparkling metallic mica flakes forming layers or foliation. Commonly found in mountainous metamorphic terrains like the Appalachians, Alps, and Scottish Highlands.
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