metamorphic
Schist
Schist (Crystalline Metamorphic Rock)
Mohs hardness: 3.5 - 6 (variable based on mineral content). Color: Silvery grey, brown, white, and yellowish tones with metallic sparkle. Luster: Vitreous to sub-metallic. Texture: Medium to coarse-grained with pronounced foliation (schistosity).
- Hardness
- 3
- Luster
- Vitreous to sub-metallic
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Physical properties
Mohs hardness: 3.5 - 6 (variable based on mineral content). Color: Silvery grey, brown, white, and yellowish tones with metallic sparkle. Luster: Vitreous to sub-metallic. Texture: Medium to coarse-grained with pronounced foliation (schistosity).
Formation & geological history
Formed through regional metamorphism of mudstone, shale, or igneous rocks under medium-grade temperature and pressure conditions (metamorphic zones). Mica flakes align perpendicular to pressure direction.
Uses & applications
Used as decorative building stone, flagging, retaining walls, and occasionally in landscape design. Sometimes extracted for industrial minerals like mica, garnet, or graphite contained within.
Geological facts
Schist is characterized by distinct parallel alignment of visible mineral grains, particularly micas, giving it a characteristic shiny, platy appearance known as schistosity.
Field identification & locations
Identified in the field by its distinct flaky, glittery texture and split-plane foliation. Commonly found in mountainous regions undergoing mountain-building (orogenic) processes worldwide.
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