1. Metamorphic Rocks

2. Refresher Rock Type Comes from….
Igneous
Sedimentary
Metamorphic
Molten rock
Sediments
Pre-existing rock

3. What turns an Pre-existing rock into a Metamorphic rock?
Remember this?
“Contact Metamorphism”
(heat only)

4. Rocks
The following slides will show you metamorphic rocks and the parent rock from which they come.

5. Remember Granite? (Igneous: Intrusive)
Plagioclase Feldspar
Orthoclase Feldspar

6. Granite turns into:
Gneiss

7. banded-gneiss in Arizona

8. Remember Limestone? (Sedimentary: Organic)

9. Limestone turns into: Marble

11. Marble bust of Pharaoh

12. Remember Sandstone? (Sedimentary: Clastic)

13. Sandstone turns into: Quartzite

14. Remember Shale? (Sedimentary: Clastic)

15. Shale turns into: Slate

17. Back in the “Little House on the Prairie” days……..

18. Now there’s one more oddball metamorphic rock that doesn’t fit the mold as the others have. This metamorphic rock can come from a variety of parent-rocks (but it still is given the same metamorphic name).
And that name is…….

19. Schist (Shhh-ist)
“Any of various medium-grained to coarse-grained metamorphic rocks composed of laminated, often flaky parallel layers of chiefly micaceous minerals.”
Schists can come from muds and clays that undergo the metamorphic process. Schists are typically named for the prominent mineral that’s in it, such as garnet schist or a mica schist.

20. Mica Schist
Garnet Schist

21. Garnet Schist – closer view

23. Schist triad sculptures of Menkaure
(Mĕnkoo’rā)
2525 b.c., king of ancient Egypt. He built the third pyramid at Giza.

24. Schists are frequently used in building houses or walls, as many are quite durable and strong. Most of the building foundations built in the 1920’s and 30’s within the New York city area used schist.
Manhattan Schist