metamorphic
Mica Schist
Mica Schist (Quartz-Mica Schist)
Hardness: 3.5-5.5 on Mohs scale; Color: Golden-brown, bronze, silver-grey, yellowish-brown; Luster: Pearly to sub-metallic, glistening; Texture: Medium- to coarse-grained, foliated schistose texture; Cleavage: Excellent parallel foliation along mica flakes.
- Hardness
- 3
- Color
- Golden-brown, bronze, silver-grey, yellowish-brown
- Luster
- Pearly to sub-metallic, glistening
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Physical properties
Hardness: 3.5-5.5 on Mohs scale; Color: Golden-brown, bronze, silver-grey, yellowish-brown; Luster: Pearly to sub-metallic, glistening; Texture: Medium- to coarse-grained, foliated schistose texture; Cleavage: Excellent parallel foliation along mica flakes.
Formation & geological history
Formed by regional metamorphism of shale, mudstone, or clay-rich sedimentary rocks under moderate temperatures and pressures (regional metamorphism), causing fine clay minerals to recrystallize into coarse mica flakes.
Uses & applications
Mainly collected as geological educational specimens and display pieces; occasionally used as decorative flagstone or dimension stone where foliation allows splitting.
Geological facts
The shimmering, glinting appearance of mica schist often caused early prospectors to mistake it for gold or silver deposits, earning mica nickname 'fool's gold' in certain contexts along with pyrite.
Field identification & locations
Identified in the field by its distinct foliation (schistosity) and bright, shimmering mineral flakes aligned in parallel layers that catch the light. Highly widespread in metamorphic terranes worldwide, such as the Appalachian Mountains and the Alps.
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