granulite facies

granulite facies

One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks that formed under intense temperature-pressure conditions (higher than 950°F, or 500°C). The minerals found in the rocks of granulite facies include hornblende, pyroxene, biotite, garnet, calcium plagioclase, and quartz or olivine. See also amphibolite facies.

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