metamorphic
Schist
Mica Schist
Hardness: 3.5-4 Mohs (mica components); Color: Grey, silvery, brownish due to iron oxidation; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent basal cleavage in micas; Specific Gravity: 2.7-2.9
- Hardness
- 3
- Color
- Grey, silvery, brownish due to iron oxidation
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-4 Mohs (mica components); Color: Grey, silvery, brownish due to iron oxidation; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Excellent basal cleavage in micas; Specific Gravity: 2.7-2.9
Formation & geological history
Formed by regional metamorphism of shale or sedimentary rocks under intermediate-to-high temperature and pressure conditions, typically during mountain-building events.
Uses & applications
Used for decorative garden stones, paving, roofing material, and occasionally as a source of industrial minerals like garnet or graphite.
Geological facts
Schist is characterized by its 'schistosity,' a texture where large, platy minerals like mica flatly align. It is often the result of the further metamorphism of phyllite.
Field identification & locations
Identified by its visible layering (foliation) and shiny, platy mineral flakes. Commonly found in metamorphic terrains like the Appalachian or Himalayan mountains. Look for the characteristic 'sparkle' in sunlight.
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