metamorphic
Mica Schist
Schist (muscovite-biotite rich)
Hardness: 2-4 (Mohs scale); Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (highly reflective); Structure: Foliated with visible glittery flakes; Cleavage: Perfect basal cleavage in individual mica grains; Specific gravity: 2.7-3.0
- Hardness
- 2-4 (Mohs scale)
- Color
- Silvery-gray, brownish, or golden
- Luster
- Pearly to metallic (highly reflective)
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Physical properties
Hardness: 2-4 (Mohs scale); Color: Silvery-gray, brownish, or golden; Luster: Pearly to metallic (highly reflective); Structure: Foliated with visible glittery flakes; Cleavage: Perfect basal cleavage in individual mica grains; Specific gravity: 2.7-3.0
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks (shale or mudstone) at medium temperatures and pressures. This specimen exhibits strong foliation characterized by large, visible mica flakes.
Uses & applications
Historical use in insulation and electrical components due to the mica content. Today primarily used as a decorative stone in landscaping, flagstone construction, or as a low-cost geological specimen for education.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to how easily the rock can be cleaved along its mineral layers. It is distinguished from phyllite by having larger mica crystals visible to the naked eye.
Field identification & locations
Identify in the field by its distinct 'glittery' appearance and its tendency to flake off into small, flat scales when scratched. Commonly found in mountain belts and metamorphic terrains like the Appalachians or the Alps.
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