metamorphic

Mica Schist

Mica Schist (primarily composed of Muscovite/Biotite)

AI-generated identification · may be incorrect

Hardness: 2-4 (Mohs); Color: Silver, grey, or black; Luster: Pearly to metallic (highly reflective); Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.8-3.0

Hardness: 2-4 (Mohs)
Color: Silver, grey, or black
Luster: Pearly to metallic (highly reflective)

Identified May 29, 2026More metamorphic →

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Physical properties

Hardness: 2-4 (Mohs); Color: Silver, grey, or black; Luster: Pearly to metallic (highly reflective); Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific Gravity: 2.8-3.0

Formation & geological history

Formed through the regional metamorphism of shale or clay-rich sedimentary rocks under medium pressure and temperature. Primarily found in metamorphic belts of mountain ranges.

Uses & applications

Used as an ornamental stone, in the production of filler materials, sometimes for building facades, used in ground form as a lubricant or in paint/cosmetics for shimmer.

Geological facts

The term 'Schist' comes from the Greek word 'schistos', meaning 'split', referring to the stone's ability to be easily split into thin plates. It represents a higher metamorphic grade than phyllite.

Field identification & locations

Identify by its 'schistosity' - a layered, foliated structure with clearly visible mica flakes that glitter in the light. Found worldwide in metamorphic terrains like the Appalachians or Alps.