Rock transformed by changes in temperature, pressure, deformation or fluid conditions while predominantly remaining solid.
A common descriptive name for low-grade metamorphosed mafic volcanic rock, often containing greenish minerals. A greenstone belt can contain these rocks together with other volcanic and sedimentary rocks; the belt name does not imply uniform composition or density.
A metamorphic rock with compositional banding; its bulk composition can be felsic, intermediate or mafic.
A metamorphic rock formed from a sedimentary rock precursor.
A high-grade metamorphic rock with an assemblage characteristic of granulite facies; both felsic and mafic examples occur.
A mafic rock with a granulite-facies assemblage. Granulite alone specifies a metamorphic facies, not the mafic composition.
A metamorphic rock dominated by amphibole and plagioclase, commonly derived from a mafic precursor.

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