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Greenschist facies is a common low grade
metamorphism that produces rocks that are greenish because of the
chlorite and biotite present.
Amphibolite facies is a medium to high
grade type of regional metamorphism, which is very common. The minerals
include members from the amphibolite (hornblende) family.
Granulite facies is the maximum grade of
region metamorphism found in older metamorphic rock formation.
Eclogite facies represents a very deep,
high grade form of metamorphisms found with high pressures and
temperatures.
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