mineral
Muscovite Mica in Quartz Matrix
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 2-2.5 (Muscovite), 7 (Quartz). Color: Silvery-white to translucent flakes in white/clear matrix. Luster: Pearly to metallic on flakes, vitreous on quartz. Crystal Structure: Monoclinic (sheets). Cleavage: Perfect basal cleavage allowing thin, flexible sheets.
- Hardness
- 2-2
- Color
- Silvery-white to translucent flakes in white/clear matrix
- Luster
- Pearly to metallic on flakes, vitreous on quartz
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Physical properties
Hardness: 2-2.5 (Muscovite), 7 (Quartz). Color: Silvery-white to translucent flakes in white/clear matrix. Luster: Pearly to metallic on flakes, vitreous on quartz. Crystal Structure: Monoclinic (sheets). Cleavage: Perfect basal cleavage allowing thin, flexible sheets.
Formation & geological history
Formed in granitic pegmatites and metamorphic rocks (schists/gneiss) through the cooling of silica-rich magma or through regional metamorphism. Common throughout various geological eras, especially in Precambrian shields.
Uses & applications
Used in electrical insulation, heat-resistant windows (isnglass), cosmetics for shimmer, and as a filler in paints and plastics. Quartz matrix is used in glass making and electronics.
Geological facts
Known as 'Muscovy Glass' historically because it was used as a cheaper, more durable alternative to glass for windows in Russia. Individual sheets are virtually fireproof.
Field identification & locations
Identified in the field by the 'book-like' layering of silvery flakes that can be peeled with a fingernail. Found globally, especially in Brazil, India, and the Appalachian Mountains. Collectors look for large, undamaged 'books' of mica.
