metamorphic
Schist
Mica Schist (Foliated Metamorphic Rock)
AI-generated identification · may be incorrectHardness: 3.5-5.5 on Mohs scale; Color: Grayish-green to silver-gray with yellowish-brown weathered edges; Luster: Pearly to vitreous, shimmering due to mica flakes; Structure: Foliated with prominent schistosity; Cleavage: Good parallel parting along foliation planes
- Hardness
- 3
- Luster
- Pearly to vitreous, shimmering due to mica flakes
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Physical properties
Hardness: 3.5-5.5 on Mohs scale; Color: Grayish-green to silver-gray with yellowish-brown weathered edges; Luster: Pearly to vitreous, shimmering due to mica flakes; Structure: Foliated with prominent schistosity; Cleavage: Good parallel parting along foliation planes
Formation & geological history
Formed through regional metamorphism of clay-rich mudstone, shale, or igneous rocks under moderate temperatures and pressures during mountain-building events.
Uses & applications
Used occasionally as decorative dimension stone, flagstone, landscaping, and as a educational/geological collection specimen.
Geological facts
The shimmering effect of schist comes from the alignment of platy mica minerals (biotite, muscovite, chlorite) under intense directed pressure.
Field identification & locations
Identified by its distinctive sparkly, foliated layered appearance and tendency to split easily along mineral alignment planes. Widespread in metamorphic terranes worldwide.
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