metamorphic
Schist
Schist (variety likely Mica Schist)
Hardness: 3.5-4; Color: Greyish-green to silvery; Luster: Pearly to sub-metallic; Structure: Foliated with distinct layering; Cleavage: Excellent in one direction (schistosity)
- Hardness
- 3
- Color
- Greyish-green to silvery
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Greyish-green to silvery; Luster: Pearly to sub-metallic; Structure: Foliated with distinct layering; Cleavage: Excellent in one direction (schistosity)
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under high pressure and temperature, often during mountain-building events. Geological age varies by location.
Uses & applications
Used as a decorative stone in garden walls, flagstones for pathways, and occasionally as a source of industrial minerals like mica or graphite.
Geological facts
The term 'schist' comes from the Greek word 'schistos,' meaning 'easy to split,' referring to how the rock naturally breaks along its mineral layers.
Field identification & locations
Identified by its 'shimmery' appearance due to mica flakes and its ability to be split into thin plates. Commonly found in metamorphic belts worldwide.
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