metamorphic
Mica Schist
Mica Schist (Complex Silicate Rock)
Hardness: 3.5-4 on Mohs scale; Color: Silver, gray, to brownish-gold; Luster: Pearly to metallic (glittery); Crystal structure: Foliated (schistose); Cleavage: Perfect basal in mica grains; Specific gravity: 2.7-2.8
- Hardness
- 3
- Color
- Silver, gray, to brownish-gold
- Luster
- Pearly to metallic (glittery)
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Physical properties
Hardness: 3.5-4 on Mohs scale; Color: Silver, gray, to brownish-gold; Luster: Pearly to metallic (glittery); Crystal structure: Foliated (schistose); Cleavage: Perfect basal in mica grains; Specific gravity: 2.7-2.8
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under intermediate to high pressure and temperature. This process transforms clay minerals into larger mica plates aligned perpendicularly to the direction of pressure. Most specimens date from the Proterozoic or Paleozoic eras.
Uses & applications
Used in landscaping, as a building stone (facing), and occasionally in the manufacture of heat-resistant materials or cosmetics if the mica content is high and easily extracted. It is also common in educational rock kits.
Geological facts
Mica schist is known for its 'schistosity,' which gives it a characteristic glitter or sparkle. Historically, it was used in some cultures for ornamental pieces because it is relatively easy to carve along its foliation planes.
Field identification & locations
Identify in the field by its distinct layered appearance and shimmering surface. It breaks relatively easily into flat, thin plates. Commonly found in mountainous regions such as the Appalachian Mountains, the Alps, and the Himalayas.
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