Metamorphic
Schist
Schist
Medium- to coarse-grained metamorphic rock with a foliated fabric. Composed of platy minerals, mostly micas (muscovite and biotite), that form a foliated, sheet-like structure.
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Physical properties
Medium- to coarse-grained metamorphic rock with a foliated fabric. Composed of platy minerals, mostly micas (muscovite and biotite), that form a foliated, sheet-like structure.
Formation & geological history
Formed by regional metamorphism of shale, siltstone, or volcanic tuffs at medium to high temperatures and pressures.
Uses & applications
Locally used for dimension stone, paving, and occasionally roofing, but less common than slate or granite due to lower strength.
Geological facts
The word schist is derived from the Greek word 'skhizein' meaning 'to split', referring to the ease with which schists can be split along the plane in which the platy minerals lie.
Field identification & locations
Identified by its shiny, reflective surface due to mica content and its wavy, foliated texture. It lacks the compositional banding of gneiss.
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