metamorphic
Mica Schist with Quartz
Crystalline Schist (SiO2 + KAl2(AlSi3O10)(OH)2)
Hardness: 2.5-3 (mica), 7 (quartz); Color: Silver, grey, white, tan; Luster: Pearly to metallic (mica), Vitreous (quartz); Crystal Structure: Monoclinic plates; Cleavage: Perfect basal cleavage in mica flakes.
- Hardness
- 2
- Color
- Silver, grey, white, tan
- Luster
- Pearly to metallic (mica), Vitreous (quartz)
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Physical properties
Hardness: 2.5-3 (mica), 7 (quartz); Color: Silver, grey, white, tan; Luster: Pearly to metallic (mica), Vitreous (quartz); Crystal Structure: Monoclinic plates; Cleavage: Perfect basal cleavage in mica flakes.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks like shale or mudstone under high pressure and temperature conditions deep within the Earth's crust.
Uses & applications
Used in construction as a decorative stone, and historically for furnace linings. Mica is also widely used in electronics and cosmetics for its shimmer.
Geological facts
The word 'schist' is derived from the Greek word 'schistos', meaning 'split', referring to the ease with which the rock can be split into thin layers or sheets due to its foliation.
Field identification & locations
Identify by looking for 'schistosity'—the distinct alignment of shiny mineral grains like muscovite or biotite. Frequently found in mountainous regions or ancient riverbeds.
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