metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
Hardness: 2-3 (Mica) to 7 (Quartz); Color: Silvery-gray, brownish, or golden; Luster: Pearly to Vitreous/Metallic (sparkly); Structure: Schistose (layered/foliated with visible grains); Cleavage: Perfect basal in mica flakes.
- Hardness
- 2-3 (Mica) to 7 (Quartz)
- Color
- Silvery-gray, brownish, or golden
- Luster
- Pearly to Vitreous/Metallic (sparkly)
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Physical properties
Hardness: 2-3 (Mica) to 7 (Quartz); Color: Silvery-gray, brownish, or golden; Luster: Pearly to Vitreous/Metallic (sparkly); Structure: Schistose (layered/foliated with visible grains); Cleavage: Perfect basal in mica flakes.
Formation & geological history
Formed from the metamorphism of shale or clay minerals under intermediate temperature and pressure deep within the Earth's crust, often during mountain-building events.
Uses & applications
Used occasionally as a building stone, decorative landscaping rock, and in the production of ground mica for cosmetics, drilling fluids, and electrical insulation.
Geological facts
Schist is characterized by having more than 50% platy and elongated minerals. The word 'schist' comes from the Greek word 'schizein', meaning 'to split', referring to the way it easily peels into thin layers.
Field identification & locations
Identify in the field by its distinct 'sparkle' in sunlight and its layered, flaky appearance. It is commonly found in metamorphic terranes such as the Appalachian Mountains or the Alps.
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