metamorphic
Schist
Mica Schist
Hardness: 3.5-4; Color: Grey, green, or silvery; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (slaty/schistose)
- Hardness
- 3
- Color
- Grey, green, or silvery
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4; Color: Grey, green, or silvery; Luster: Pearly to sub-metallic; Structure: Foliated with visible mineral grains; Cleavage: Perfect in one direction (slaty/schistose)
Formation & geological history
Formed by the regional metamorphism of shale or mudstone under high pressure and temperature, typically during mountain-building events.
Uses & applications
Used as decorative stone in gardens, facing stone for walls, and occasionally as a source for certain minerals like garnets or graphite.
Geological facts
The term 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to the ease with which it can be parted into thin plates.
Field identification & locations
Identified by its shiny, flaky appearance caused by mica alignment. Look for parallel layers of minerals that glisten in sunlight. Found in regional metamorphic belts.
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