1. Metamorphic Rocks

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

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

4. Contact Metamorphism
Caused by contact with extreme heat.

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

6. Distorted Structure

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

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

10. Banding vs. Layers
Bands
Layers

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

13. A Piece of Schist

14. Holey Schist

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

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

17. Slate + + =
Phyllite

18. Phyllite + + =
Schist

19. Schist + + =
Gneiss