2. Metamorphic Rocks

3. Metamorphic rocks have been changed from a pre-existing rock. Caused by extreme heat and/or pressure.

4. Regional Metamorphism Caused by extreme pressure and heat. Happens over wide “regions”.

5. Contact Metamorphism Caused by contact with extreme heat.

6. Meta. rocks will often have foliation or a distorted structure.

7. Distorted Structure

8. Foliation is a “grain” to the rock.

9. Types of Foliation: Gneissic Foliation- minerals are squished into bands. “Zebra Stripes”

11. Bands Layers Banding vs. Layers

13. Schistose foliation- minerals have been squashed into flakes of mica.

16. Slaty foliation- Rock splits into flat, thin layers.

17. Take out your Handy Dandy Earth Science Reference Tables Page 7.

18. Slate Phyllite + = +

19. Phyllite Schist + = +

20. Gneiss + = +