metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
Hardness: 3.5-4; Color: Bronze, brown, or golden-yellow with silver flakes; Luster: Pearly to metallic; Structure: Foliated (schistose); Cleavage: Perfect basal (mica flakes flakes easily); SG: 2.7-2.8
- Hardness
- 3
- Color
- Bronze, brown, or golden-yellow with silver flakes
- Luster
- Pearly to metallic
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Physical properties
Hardness: 3.5-4; Color: Bronze, brown, or golden-yellow with silver flakes; Luster: Pearly to metallic; Structure: Foliated (schistose); Cleavage: Perfect basal (mica flakes flakes easily); SG: 2.7-2.8
Formation & geological history
Formed through regional metamorphism of shale or mudstone under medium-grade temperatures and pressures. Most common in mountain-building belts (orogenic zones).
Uses & applications
Used primarily as decorative stone, in construction as fill, and historically for glitters or insulative materials. Mica itself is used in electronics and cosmetics.
Geological facts
The word 'Schist' is derived from the Greek word 'schizein' meaning 'to split', referring to how the rock easily divides along parallel layers and mica plates.
Field identification & locations
Identify by its sparkly, 'glittery' appearance and foliated texture that allows flakes to be picked off with a fingernail. Found in the Appalachian Mountains and metamorphic terrains globally.
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