metamorphic
Mica Schist
Mica Schist (Intermediate-grade Metamorphic Rock)
Hardness: 3.5–4.0; Color: Silvery-gray, reddish-brown, or bronze; Luster: Pearly to sub-metallic (shimmery); Structure: Foliated with large, visible mica grains; Cleavage: High fissility (splits into thin sheets).
- Hardness
- 3
- Color
- Silvery-gray, reddish-brown, or bronze
- Luster
- Pearly to sub-metallic (shimmery)
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Physical properties
Hardness: 3.5–4.0; Color: Silvery-gray, reddish-brown, or bronze; Luster: Pearly to sub-metallic (shimmery); Structure: Foliated with large, visible mica grains; Cleavage: High fissility (splits into thin sheets).
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate temperature and pressure conditions during mountain-building events (orogeny). Often Precambrian to Paleozoic in age.
Uses & applications
Used as dimension stone for building facades, decorative garden stones, and historically for roofing or walling; some varieties are processed for the pearly luster in cosmetics or insulation.
Geological facts
Mica schist is characterized by 'schistosity,' which is the alignment of mica flakes so large that they can be seen with the naked eye. It often contains accessory minerals like red garnets.
Field identification & locations
Identify in the field by its distinct 'glittery' appearance and wavy or planar foliation. It is commonly found in crystalline mountain ranges such as the Appalachians or the Alps. Look for the way it flakes into thin, brittle pieces.
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