metamorphic

Schist

Metamorphic Schist

AI-generated identification · may be incorrect

Hardness: 3-4 on Mohs scale; Color: Grey, green, silver, or brown; Luster: Pearly to shiny due to mica content; Crystal structure: Foliated with visible, aligned platy minerals; Cleavage: Good planar cleavage (schistosity).

Hardness: 3-4 on Mohs scale
Color: Grey, green, silver, or brown
Luster: Pearly to shiny due to mica content

Identified August 1, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed by regional metamorphism of mudstone or shale under moderate to high temperatures and pressures, typically during mountain-building events.

Uses & applications

Used occasionally as a decorative landscape stone, garden stepping stones, or in low-grade construction aggregates, though rarely structural due to foliation.

Geological facts

Schist is characterized by its high abundance of platy minerals like micas, chlorite, or talc, which give it a distinct sparkly appearance on broken surfaces.

Field identification & locations

Easily identified by its prominent foliation (layering) and sparkling, glittering surface caused by reflective mica flakes. Found globally in regions with ancient or active orogenic belts.