metamorphic

Schist

Metamorphic rock (Schist)

AI-generated identification · may be incorrect

Hardness: 3-4 on Mohs scale; Color: Gray, green, silver, or brown with a sparkly appearance; Luster: Pearly to shiny due to mica content; Crystal structure: Foliated texture with visible platy minerals aligned in parallel bands; Cleavage: Good planar cleavage (schistosity); Specific Gravity: 2.7-3.0

Hardness: 3-4 on Mohs scale
Color: Gray, green, silver, or brown with a sparkly appearance
Luster: Pearly to shiny due to mica content

Identified August 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through regional metamorphism of mudstone, shale, or igneous rocks under high temperature and pressure conditions, typically over hundreds of millions of years.

Uses & applications

Used in landscaping, as a decorative stone, and sometimes in construction or aggregate, though its foliation makes it structurally weak for heavy load-bearing purposes.

Geological facts

Schist often contains prominent accessory minerals such as garnet, staurolite, or kyanite, making it a favorite for rockhounds searching for embedded crystals.

Field identification & locations

Easily identified by its distinct foliated, sparkly appearance caused by the alignment of mica flakes. Found worldwide in ancient mountain belts and shield areas.