metamorphic
Mica Schist
Schist (Biotite/Muscovite dominant)
Hardness: 3.5-4; Color: Silvery-gray, brownish-black with sparkling flakes; Luster: Pearly to submetallic; Crystal Structure: Foliated (schistose); Cleavage: Perfect basal cleavage in individual mica grains.
- Hardness
- 3
- Color
- Silvery-gray, brownish-black with sparkling flakes
- Luster
- Pearly to submetallic
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Physical properties
Hardness: 3.5-4; Color: Silvery-gray, brownish-black with sparkling flakes; Luster: Pearly to submetallic; Crystal Structure: Foliated (schistose); Cleavage: Perfect basal cleavage in individual mica grains.
Formation & geological history
Formed through regional metamorphism of shale or mudstone under intermediate to high temperature and pressure. The alignment of mica minerals creates the characteristic foliated texture.
Uses & applications
Mainly used as a decorative stone in landscaping, building facades, and occasionally for ground mica in industrial lubricants or drywall joint compound.
Geological facts
The term schist comes from the Greek word 'schistos', meaning 'split', referring to the ease with which these rocks can be divided into thin layers.
Field identification & locations
Look for a distinct 'glittery' appearance due to the presence of large mica flakes. It splits easily along parallel planes. Commonly found in mountain ranges or areas with exposed metamorphic basement rock.
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