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Metamorphic Rocks
Metamorphic rocks have
been changed from a
pre-existing rock.
Caused by extreme heat
and/or pressure.
Regional Metamorphism
Caused by extreme
pressure and heat.
Happens over wide
“regions”. (areas)
Contact Metamorphism
Caused by DIRECT
contact with extreme
The texture of a
metamorphic rock is called
foliated. The grain is in bands.
Distorted Structure
Types of Foliation:
Gneissic Foliation- minerals
are squished into bands.
“Zebra Stripes”
Nonfoliated - Metamorphic Rocks are
rocks that are not arranged in bands.
Example- Marble and Quartzite
Banding vs. Layers
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