Download Examining Sedimentary Rocks

Examining Sedimentary Rocks
Rock Descriptions:
11. Conglomerate: Usually gravel type sediments consolidated and cemented by naturally
occurring materials.
12. Gypsum: A common mineral precipitated from evaporating sea water, may be either
massive or crystalline.
13. Shale: This rock has may forms, usually results from the compression and
consolidation of mud-like sediments.
14. Limestone: Consists mainly of the mineral calcite, usually of marine origin.
15. Sandstone: This rock is largely quartz sand, packed by pressure of overlying layers of
sediment.
Procedure:
1. For each rock you should examine it with a magnifying glass. Then you are to
give a very precise description of the rock. This should be at least 3 sentences.
2. Then for each rock you should answer the following:
-Is it a clastic sedimentary rock, an evaporite, or an organic sedimentary rock?
Describe how you came to this conclusion.
-IF it is clastic which type?
3. Which types of rock did you try and make in your lab? (There are three) How do
you know?
4. For Rock number 14. Put some HCl on the rock.
- What did you see happen?
- What chemical is in this rock and other rocks that we have examined
that reacts with HCL?
5. Describe in general how a sedimentary rock is made.
6. Which rock did you like the best? Why?
7. Write 5 sentences about what you have learned.