Item talk:Q158195

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Mindat Description

Rock formed by geological modification of pre-existing rocks outside the realm of igneous and sedimentary processes.

Geoscience Ontology Description

Rock formed by geological modification of pre-existing rocks outside the realm of igneous and sedimentary processes. Includes rocks formed by impact metamorphism, standard dynamothermal metamorphism, brittle deformation, weathering, metasomatism and hydrothermal alteration (diagenesis is a sedimentary process in this context).

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