metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
Hardness: 2-4 (Mohs scale) for mica components; Color: Silvery-gray to brownish-gold; Luster: Pearly to sub-metallic; Crystal structure: Monoclinic (foliated); Cleavage: Perfect basal; Specific gravity: 2.8-3.0
- Hardness
- 2-4 (Mohs scale) for mica components
- Color
- Silvery-gray to brownish-gold
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 2-4 (Mohs scale) for mica components; Color: Silvery-gray to brownish-gold; Luster: Pearly to sub-metallic; Crystal structure: Monoclinic (foliated); Cleavage: Perfect basal; Specific gravity: 2.8-3.0
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high grades of temperature and pressure. It originates in mountain-building tectonic environments.
Uses & applications
Primarily used as an ornamental stone in landscaping and exterior wall cladding. Historically used for roofing or flagstones, and mica minerals are extracted for use in electronics and cosmetics.
Geological facts
The term 'schist' comes from the Greek word 'schistos', meaning 'split', referring to the stone's ability to be easily flaked into thin plates. Its glittery appearance often causes it to be mistaken for precious metals by novice collectors.
Field identification & locations
Identify by its 'schistosity'—a wavy, foliated texture characterized by large, visible mica flakes that glitter in the light. Found in metamorphic belts such as the Appalachian or Alpine ranges.
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