metamorphic
Mica Schist
Schist (Mica-rich Metamorphic Rock)
Hardness: 3-5 on Mohs scale; Color: Silvery-tan, golden-brown, greyish, with reflective sparkling mineral grains; Luster: Pearly to sub-metallic sparkle due to micas; Texture: Medium to coarse-grained with pronounced foliation (schistosity); Specific gravity: ~2.7-2.9.
- Hardness
- 3-5 on Mohs scale
- Luster
- Pearly to sub-metallic sparkle due to micas
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Physical properties
Hardness: 3-5 on Mohs scale; Color: Silvery-tan, golden-brown, greyish, with reflective sparkling mineral grains; Luster: Pearly to sub-metallic sparkle due to micas; Texture: Medium to coarse-grained with pronounced foliation (schistosity); Specific gravity: ~2.7-2.9.
Formation & geological history
Formed by regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under moderate temperature and pressure deep within continental crust during mountain-building events.
Uses & applications
Mainly used as a decorative building stone, flagging, landscaping material, and historically for hearths due to heat resistance. High-grade specimens are collected for geological educational displays.
Geological facts
The sparkle comes from aligned sheets of muscovite or biotite mica. Under intense geological pressure, clay minerals recrystallize into micas aligned perpendicular to the direction of maximum stress.
Field identification & locations
Identify in the field by its distinct glittering, flaky, sheet-like mica layers that easily reflect light. Found globally in metamorphic terranes, metamorphic belts, and ancient mountain chains.
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