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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 heat. 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 Marble Banding vs. Layers Bands Layers