Quartz typically crystallizes in a variety of metamorphic environments, and its presence is characteristic of certain metamorphic facies. When quartz is fully crystallized, it can be primarily found in the following metamorphic facies:
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Greenschist Facies: Quartz can be a dominant mineral in greenschist facies, which is characterized by low to medium-grade metamorphism. In this facies, quartz often occurs alongside minerals like chlorite, biotite, and garnet.
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Amphibolite Facies: Quartz is also common in amphibolite facies, typically associated with higher-grade metamorphism than greenschist. This facies includes minerals such as hornblende and plagioclase.
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Granulite Facies: In granulite facies, which represents even higher metamorphic conditions, quartz can coexist with minerals like feldspar, garnet, and various mafic minerals, often in a more granular form.
Overall, quartz can exist in various metamorphic facies but is particularly well-recognized in greenschist, amphibolite, and granulite facies, depending on the grade of metamorphism and the conditions under which the rock forms.
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