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A type of rock formed from pre-existing rocks that have been transformed by heat, pressure, or chemically active fluids.
Les roches métamorphiques se forment souvent dans les zones de subduction.
Metamorphic rocks often form in subduction zones.
The transformation process can alter the mineral composition and texture of the original rock.
Metamorphic rocks include schist, gneiss, and marble.
Metamorphic rocks often have banded or foliated textures due to the alignment of minerals under pressure.
From French 'roche' (rock) + 'métamorphique' (metamorphic), derived from Greek 'metamorphoun' (to transform).
In geology, this term refers specifically to rocks altered by metamorphism, not to be confused with sedimentary or igneous rocks.