metamorphic
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
Hardness: 3.5 to 7 (varies by mineral content); Color: Silvery-gray, brownish, or dark gray; Luster: Pearly to vitreous (sparkly due to mica flakes); Foliated texture with visible parallel mica flakes; Specific Gravity: ~2.7-3.0.
- Hardness
- 3
- Color
- Silvery-gray, brownish, or dark gray
- Luster
- Pearly to vitreous (sparkly due to mica flakes)
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Physical properties
Hardness: 3.5 to 7 (varies by mineral content); Color: Silvery-gray, brownish, or dark gray; Luster: Pearly to vitreous (sparkly due to mica flakes); Foliated texture with visible parallel mica flakes; Specific Gravity: ~2.7-3.0.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (like shale or mudstone) under intermediate-grade temperature and high pressure during mountain-building events.
Uses & applications
Used primarily as decorative stone, flagstone, landscape rocks, and occasionally in crushed stone applications. Historically used as building stones in regions where abundant.
Geological facts
Schist is characterized by 'schistosity', a texture of preferred orientation of coarse mica flakes that allows the rock to split into thin layers or sparkle brightly in light.
Field identification & locations
Look for a distinct sparkly or flaky surface made of tiny mica plates. Found in metamorphic terranes worldwide such as mountain belts (e.g., Appalachian Mountains, Alps, Himalayas). Very common specimen.
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