1. Rocks and Minerals
Metamorphic rocks

2. Metamorphic Rocks:
form as a result of heat, pressure and chemical activity
are divided into two groups based on whether they formed from regional or contact metamorphism.

3. Regional Metamorphic Rocks
formed by forces acting over large areas
formed at extreme temperature and pressure
form at great depths within the earth’s crust
form during mountain building due to plate tectonics

4. Contact Metamorphic Rocks
Form at the interface of hot magma and existing rock
Forms only locally where the minerals are changed by the extreme heat without actually melting

5. Characteristics of metamorphic rocks
Distortion - a change in the structure of a rock without changing the composition of the rock
Banding or zoning - when minerals become concentrated into bands of different colored minerals (pennies in clay)

6. Increased density - metamorphic rocks are often denser than the rocks they formed from because they are exposed to such high pressure.

7. Marble - metamorphosed limestone, fizzes with acid
Slate - formed from shale, very smooth
Quartzite - formed from sandstone, harder than glass
Gneiss - usually forms from granite, often banded
Schist - exhibits schistosity, often contains mica or garnet.

8. Marble

9. Slate

10. Quartzite

11. Gneiss

12. Schist

13. Mica Schist

14. Garnet Schist

15. A Big Pile of Schist

17. Metaconglomerate