metamorphic
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2 with SiO2)
Hardness: 2.5-3 (mica) and 7 (quartz); Color: Silvery-gray and tan with white inclusions; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (sheets) and Trigonal; Cleavage: Perfect basal.
- Hardness
- 2
- Color
- Silvery-gray and tan with white inclusions
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2.5-3 (mica) and 7 (quartz); Color: Silvery-gray and tan with white inclusions; Luster: Pearly to vitreous; Crystal Structure: Monoclinic (sheets) and Trigonal; Cleavage: Perfect basal.
Formation & geological history
Formed through the regional metamorphism of shale or sedimentary protoliths under intermediate temperatures and pressures, typically during mountain-building events.
Uses & applications
Muscovite is used as an electrical insulator, in cosmetics (glitter), and paint filler. Schist can be used for decorative garden stone or flooring.
Geological facts
The term 'schist' comes from the Greek word 'schistos,' meaning 'easy to split,' referring to its prominent foliation or sheet-like layers.
Field identification & locations
Identify in the field by its distinct 'sparkle' or 'sheen' when rotated in sunlight and its tendency to flake off in thin, flexible sheets with a fingernail.
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