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METAMORPHIC ROCKS
Lesson 4 - Page 4

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Zeolite facies is the lowest grade of burial metamorphism. It main minerals are quartz, muscovite and chlorite. Recrystallization is usually incomplete so these rocks donít look as squished.

Hornfels facies is confined to high temperature with lower pressured and associated with contact metamorphisms. The minerals present include plagioclase, orthoclase, and quartz. Lower temperatures to higher temperatures produce other types of minerals. 

Blueschist facies is a low grade type of regional metamorphism specially in mountain building areas. Blue minerals like glaucophane are common, with quartz, chlorite, muscovite and garnet. 


Zeolite


Hornfel


Blueschist

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