metamorphic
Mica Schist
Mica-rich Schist containing Muscovite and Quartz
Hardness: 3.5-4 on Mohs scale; Color: Silvery-gray, white, and earthy brown; Luster: Pearly to sub-metallic (from mica flakes); Structure: Foliated with visible flaky grains; Cleavage: Perfect basal on mica flakes.
- Hardness
- 3
- Color
- Silvery-gray, white, and earthy brown
- Luster
- Pearly to sub-metallic (from mica flakes)
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Silvery-gray, white, and earthy brown; Luster: Pearly to sub-metallic (from mica flakes); Structure: Foliated with visible flaky grains; Cleavage: Perfect basal on mica flakes.
Formation & geological history
Formed through the regional metamorphism of shale or mudstone at medium grades of pressure and temperature. The original clay minerals recrystallize into large, visible flakes of mica.
Uses & applications
Primarily used in landscaping, as a building stone (flagstone), and historically as a source of scrap mica for industrial insulation and glitters.
Geological facts
The word 'schist' comes from the Greek word 'schistos', meaning 'split', referring to the rock's ability to be easily split into thin layers along its foliation planes.
Field identification & locations
Identify in the field by its distinct 'shimmer' or 'sparkle' when turned in sunlight. It is commonly found in mountain belts and metamorphic terrains. Collectors look for well-defined foliation and larger mica crystals.
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