metamorphic
Mica Schist with Quartz and Muscovite
Muscovite-Quartz Schist
Hardness: 2.5-3 (mica layers), 7 (quartz areas); Color: silvery-tan to brownish-white with shiny metallic flecks; Luster: Pearly to sub-metallic, vitreous; Crystal Structure: Monoclinic (muscovite) and Trigonal (quartz); Cleavage: Perfect basal cleavage in mica layers; Specific Gravity: ~2.7-3.0
- Hardness
- 2
- Color
- silvery-tan to brownish-white with shiny metallic flecks
- Luster
- Pearly to sub-metallic, vitreous
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Physical properties
Hardness: 2.5-3 (mica layers), 7 (quartz areas); Color: silvery-tan to brownish-white with shiny metallic flecks; Luster: Pearly to sub-metallic, vitreous; Crystal Structure: Monoclinic (muscovite) and Trigonal (quartz); Cleavage: Perfect basal cleavage in mica layers; Specific Gravity: ~2.7-3.0
Formation & geological history
Formed through regional metamorphism of clay-rich sedimentary rocks like shale or mudstone under moderate temperatures and pressures, causing micas to crystallize into parallel, reflective flakes.
Uses & applications
Used primarily as decorative stone, in construction as flagstone, or as educational mineral specimens.
Geological facts
Mica schist is known for its highly reflective, glittery surface caused by aligned sheets of muscovite or biotite mica, often giving it a shiny appearance even in small fragments.
Field identification & locations
Identified by its distinctive flaky, shimmering texture (schistosity) and soft mica layers that flake off easily with a fingernail or steel blade. Commonly found in metamorphic terranes worldwide such as Appalachian and Alpine mountain chains.
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