question archive Lab9 Exercise: Identification of Metamorphic Rocks In this laboratory exercise, you will identify the most common metamorphic rocks based on their texture and composition
Lab9 Exercise: Identification of Metamorphic Rocks In this laboratory exercise, you will identify the most common metamorphic rocks based on their texture and composition
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Lab9 Exercise: Identification of Metamorphic Rocks
In this laboratory exercise, you will identify the most common metamorphic rocks based on
their texture and composition. Feel free to download the Metamorphic Rocks Photo Guide from
Downloads (in Canvas) to help you make your identification.
Instructions
Step 1: Retrieve the bag labeled Lab #8 Metamorphic Rock Samples from your lab kit,
and place the specimens (numbered 18 through 25) on a white sheet of paper.
Step 2: Determine the identity of each rock, then write its name in the proper cell of the table below. The flow chart in Figure 8.14 will help you to narrow down the possibilities. The first determination to make is whether a sample is foliated or nonfoliated. Remember that some nonfoliated rocks occasionally show signs of banding. If you suspect a rock is not really foliated, follow up by looking for other properties, by identifying component minerals, and by conducting other tests, as necessary. If you decide to conduct an acid test (using lime/lemon juice), rinse the sample in water and dry it first so that you don’t get a false positive result from dust in the bag that may have settled on the sample.
|
Sample # |
Identification |
|
18 |
Gneiss |
|
19 |
|
|
20 |
|
|
21 |
|
|
22 |
|
|
23 |
|
|
24 |
|
|
25 |
Lab 9 Metamorphic Rocks
