metamorphic
Mica Schist
Mica Schist
Hardness: 3.5-5.0 (varies based on mineral makeup). Color: Silver-grey, brown, white, or greenish. Luster: Pearly to sub-metallic. Texture: Medium to coarse-grained foliation (schistosity). Distinct reflective sparkling flakes of mica (muscovite/biotite) visible throughout.
- Hardness
- 3
- Color
- Silver-grey, brown, white, or greenish
- Luster
- Pearly to sub-metallic
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Physical properties
Hardness: 3.5-5.0 (varies based on mineral makeup). Color: Silver-grey, brown, white, or greenish. Luster: Pearly to sub-metallic. Texture: Medium to coarse-grained foliation (schistosity). Distinct reflective sparkling flakes of mica (muscovite/biotite) visible throughout.
Formation & geological history
Formed through the regional metamorphism of clay-rich sedimentary rocks such as shale or mudstone under moderate temperatures and high pressures, causing clay minerals to recrystallize into coarse flakes of mica.
Uses & applications
Historically used as a building stone and flagstone, although less durable than granite. Primarily collected as a educational metamorphic rock sample or decorative garden element.
Geological facts
The word 'schist' comes from the Greek word 'schizein', meaning 'to split', referring to how easily the rock breaks along parallel mineral planes due to its strong foliation.
Field identification & locations
Identified in the field by its characteristic glittery appearance and visible parallel flakes of mica that easily flake off with a nail. Found worldwide in mountain ranges and ancient metamorphic terranes such as the Appalachians and the Alps.
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