metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite Schist)
Hardness: 3-5 on the Mohs scale. Color: Golden tan, bronze, silver-brown, or dark brown with sparkly highlights. Luster: Pearly to vitreous and sub-metallic due to abundant mica flakes. Texture: Medium to coarse-grained with strong schistosity (foliation).
- Hardness
- 3-5 on the Mohs scale
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Physical properties
Hardness: 3-5 on the Mohs scale. Color: Golden tan, bronze, silver-brown, or dark brown with sparkly highlights. Luster: Pearly to vitreous and sub-metallic due to abundant mica flakes. Texture: Medium to coarse-grained with strong schistosity (foliation).
Formation & geological history
Formed through regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under intermediate temperatures and pressures, causing fine clay minerals to recrystallize into coarse mica flakes.
Uses & applications
Used occasionally as decorative building stone, flagging, and landscaping rock. It is also collected by amateur geologists and educators as a classic example of metamorphic foliation.
Geological facts
Mica schist gets its brilliant glint from thousands of aligned muscovite or biotite mica flakes that reflect light simultaneously. It often contains minor accessory minerals like garnet, staurolite, or kyanite.
Field identification & locations
Easily identified by its pronounced sparkles and layered, easily flaked structure. Widely found in metamorphic terranes worldwide, such as the Appalachian Mountains, the Scottish Highlands, and the Alps.
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