metamorphic
Schist
Mica Schist
Hardness (Mohs scale): 3.5 - 4; Color: Silvery-gray to black; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal (in mica grains); Specific Gravity: 2.7 - 2.8
- Color
- Silvery-gray to black
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness (Mohs scale): 3.5 - 4; Color: Silvery-gray to black; Luster: Pearly to sub-metallic; Crystal Structure: Foliated; Cleavage: Perfect basal (in mica grains); Specific Gravity: 2.7 - 2.8
Formation & geological history
Formed from the metamorphism of shale or mudstone under medium-grade pressure and temperature (regional metamorphism). Often found in mountain belts (orogenic zones) and dated back to various geological eras including the Proterozoic and Paleozoic.
Uses & applications
Used as decorative stone in landscaping, flagstone for walkways, interior flooring, and occasionally as a source for mica in industrial applications.
Geological facts
The word 'schist' is derived from the Greek word 'schizein', meaning 'to split', referring to its characteristic foliation which allows it to be split into thin plates.
Field identification & locations
Identify by its distinct shimmering or 'glitzy' appearance caused by large mica flakes and its prominent foliation (schistosity). Commonly found in the Appalachian Mountains, Alps, and Himalayas.
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