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 (due to mica); Specific Gravity: 2.5-3.0.
- 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 (due to mica); Specific Gravity: 2.5-3.0.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under high pressure and temperature; typically found in mountain belts and Precambrian shields.
Uses & applications
Used occasionally as decorative stone for gardens, building facades, and as a source of industrial minerals like mica or graphite.
Geological facts
The word 'schist' comes from the Greek word 'schistos', meaning 'split', referring to the rock's tendency to split easily along its layers. It represents an intermediate grade of metamorphism between phyllite and gneiss.
Field identification & locations
Identify by its 'schistosity'—the distinct layering and sparkle from mica flakes. Common in regional metamorphic terrains like the Appalachians or the Alps. Look for a glittery sheen when held to light.
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