metamorphic
Schist (Micaceous Schist)
Mica Schist
Hardness: 2-3 (on Mohs scale for specific minerals); Color: Silvery-gray, gold, or brown; Luster: Pearly to metallic (highly reflective); Structure: Foliated with visible flakes; Cleavage: Perfect basal cleavage in individual flakes.
- Hardness
- 2-3 (on Mohs scale for specific minerals)
- Color
- Silvery-gray, gold, or brown
- Luster
- Pearly to metallic (highly reflective)
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Physical properties
Hardness: 2-3 (on Mohs scale for specific minerals); Color: Silvery-gray, gold, or brown; Luster: Pearly to metallic (highly reflective); Structure: Foliated with visible flakes; Cleavage: Perfect basal cleavage in individual flakes.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high temperatures and pressures. The minerals crystallize into large, visible flakes oriented perpendicular to the pressure direction.
Uses & applications
Used as a decorative stone in landscaping, flagstone for walkways, and occasionally as a source of mica for electrical insulation and sparkle in cosmetics.
Geological facts
The word 'schist' comes from the Greek 'schistos,' meaning 'easy to split.' It is a key indicator of high-pressure geological history in mountain-building zones.
Field identification & locations
Identify it by its distinct 'shimmer' or glittery appearance and its tendency to flake or split into thin layers. Common in mountainous regions like the Alps, Himalayas, and Appalachians.
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