Lab 4 Activity
Overview
For Lab 4 you will identify the 11 igneous rock samples based on observations of their colour, texture, and mineral content. The samples include the following igneous rocks:
| Andesite | Gabbro | Pegmatite | Pumice |
| Basalt (x2) | Granite | Peridotite | Rhyolite |
| Diorite | Obsidian |
Samples to Use for Lab 4
Collect the following rock samples:
| SI-31 | SI-35 | SI-47 | SI-42 |
| SI-32 | SI-45 | 300RIg | SI-43 |
| SI-41 | SI-36 | SI-37 |
What to Do Next
Use the Lab 4 worksheet (Figure 3.9) to record your observations and guide you through the identification process for each igneous rock.
Refer to Figures 3.10 to 3.12 in the Reference Tools for Igneous Rocks section of this lab manual to help you match your observations with a name.
REMEMBER: Where appropriate, include textures like amygdaloidal, porphyritic, and vesicular when you name a sample. (e.g., vesicular basalt)
