metamorphic
Mica Schist with Quartz
Mica Schist (principally Muscovite and Biotite with Quartz veins)
Hardness: 2-3 (mica) to 7 (quartz); Color: Silvery-gray, white, and bronze-brown; Luster: Pearly to vitreous; Structure: Foliated (schistosity); Cleavage: Perfect basal cleavage in mica flakes.
- Hardness
- 2-3 (mica) to 7 (quartz)
- Color
- Silvery-gray, white, and bronze-brown
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2-3 (mica) to 7 (quartz); Color: Silvery-gray, white, and bronze-brown; Luster: Pearly to vitreous; Structure: Foliated (schistosity); Cleavage: Perfect basal cleavage in mica flakes.
Formation & geological history
Formed through the regional metamorphism of shale or clay-rich sedimentary rocks under intermediate to high temperatures and pressures. The quartz veins represent silica-rich fluids that crystallized during the metamorphic process.
Uses & applications
Commonly used as decorative garden stones, in construction for flagstones or roof slates (depending on quality), and as a source of mica for industrial insulation and cosmetics.
Geological facts
The word 'schist' is derived from the Greek word 'schistos', meaning 'split', referring to the ease with which these rocks can be divided into thin layers due to the alignment of mica minerals.
Field identification & locations
Identify by the prominent 'glittery' appearance of mica flakes aligned in parallel layers. Commonly found in mountain belts such as the Appalachians, Alps, and Himalayas. Collectors look for well-defined foliation and large mica crystals.
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