Crystal formation experiment
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lab_3a.docxCrystal Growth Rate Lab
Module 3a
1. Using the glossary of your book, please look up the definitions of the following words
a. Aphanitic texture -
b. Phaneritic texture -
c. Phenocryst -
d. Groundmass -
2. Question: How does temperature affect the formation of crystals?
3. Hypothesis:
4. Results:
Fill in the tables below. If any of your samples did not produce crystals, simply enter “no crystals”. For size of crystals, I am only looking for a comparative adjective (e.g., big, small, tiny), for the appearance of crystals, I am looking for things like “they are all bunched together” or “there is just one big crystal”.
Crystal Formation Table
|
Sample (after 4 hours) |
Sample location |
Size of crystals |
Appearance of Crystals |
Photo of Crystals |
|
1 |
Room temperature |
|
|
|
|
2 |
Refrigerator |
|
|
|
|
3 |
Freezer |
|
|
|
|
Sample (overnight) |
Sample location |
Size of crystals |
Appearance of Crystals |
Photo of Crystals |
|
1 |
Room temperature |
|
|
|
|
2 |
Refrigerator |
|
|
|
|
3 |
Freezer |
|
|
|
5. Analyze the results
a. Was your prediction correct? Explain.
b. Write three sentences that compare the size and shape of the crystals in the samples.
6. Draw conclusions
|
|
Granite |
Basalt |
Obsidian |
|
How did the rock sample form? |
|
|
|
|
Rate of cooling |
|
|
|
1
