Metamorphic
Schist
Schist
Foliated texture with visible mineral grains, often platy or elongated. Color varies depending on mineral composition, often gray, brown, or black.
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Physical properties
Foliated texture with visible mineral grains, often platy or elongated. Color varies depending on mineral composition, often gray, brown, or black.
Formation & geological history
Formed from regional metamorphism of shale or mudstone under moderate to high temperature and pressure conditions.
Uses & applications
Sometimes used as a building stone or for decorative purposes, though its foliation can make it weak. Not typically used in jewelry.
Geological facts
Schist often contains index minerals like garnet, staurolite, or kyanite, which geologists use to determine the temperature and pressure conditions of its formation.
Field identification & locations
Identified by its strong foliation (schistosity), where mineral grains are aligned in parallel layers. Commonly found in areas of ancient mountain building.
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