metamorphic
Mica Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2 / SiO2)
Hardness: 2-3 (mica) and 7 (quartz); Color: Silvery-gray, white, speckled black; Luster: Pearly to sub-metallic (schistosity); Crystal Structure: Monoclinic (mica), Hexagonal (quartz); Cleavage: Perfect basal.
- Hardness
- 2-3 (mica) and 7 (quartz)
- Color
- Silvery-gray, white, speckled black
- Luster
- Pearly to sub-metallic (schistosity)
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Physical properties
Hardness: 2-3 (mica) and 7 (quartz); Color: Silvery-gray, white, speckled black; Luster: Pearly to sub-metallic (schistosity); Crystal Structure: Monoclinic (mica), Hexagonal (quartz); Cleavage: Perfect basal.
Formation & geological history
Formed at medium to high temperatures and pressures within the Earth's crust. It is a product of regional metamorphism from pelitic sediments like shale or mudstone. Most are hundreds of millions of years old.
Uses & applications
Used locally for decorative stones, building materials, and as a source of industrial mica for electronics and insulation. It is a common specimen for educational geological collections.
Geological facts
The word schist comes from the Greek word 'schistos', meaning 'split', referring to the stone's ability to be easily split into thin layers due to the alignment of mineral grains.
Field identification & locations
Identify by its 'schistosity'—a shimmering, platy appearance that glitters under light. It is commonly found in mountain ranges or areas with exposed metamorphic bedrock (e.g., the Appalachians or the Alps).
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