metamorphic
Mica schist
Mica schist (Muscovite and Biotite group)
Hardness: 2-3 (on Mohs scale); Color: Silvery-white to golden-brown; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.7-3.0
- Hardness
- 2-3 (on Mohs scale)
- Color
- Silvery-white to golden-brown
- Luster
- Pearly to metallic
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Physical properties
Hardness: 2-3 (on Mohs scale); Color: Silvery-white to golden-brown; Luster: Pearly to metallic; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.7-3.0
Formation & geological history
Formed through the regional metamorphism of shale or mudstone under high pressure and temperature. This process aligns mineral grains into flat, parallel layers known as schistosity.
Uses & applications
Primarily used as an ornamental stone, a filler in construction materials, and a source of ground mica for cosmetics, drilling muds, and electrical insulation.
Geological facts
Mica schists are noted for their high reflectivity. The word 'mica' is derived from the Latin word 'micare', meaning 'to glitter'. They have been used since prehistoric times for their sparkle in pottery and paints.
Field identification & locations
Identify in the field by its distinct 'glittery' or 'shimmery' appearance in sunlight and its tendency to flake off into thin, flexible scales when scratched. Common worldwide in mountain belts.
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