metamorphic

Mica Schist

AI-generated identification · may be incorrect

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

Identified July 25, 2026More metamorphic →

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Physical properties

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.