2.9: Detailed Figure Descriptions
- Page ID
- 28670
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The following table summarizes the four major compositions of igneous rocks (felsic, intermediate, mafic, ultramafic) and the proportions of common minerals in each. The names for both intrusive and extrusive rock names are summarized at the bottom of the table.
| Felsic | Intermediate | Mafic | Ultramafic | |
|---|---|---|---|---|
| K-feldspar | 0 to 35% | 0% | 0% | 0% |
| Quartz | 25 to 35% | 0 to 25% | 0% | 0% |
| Plagioclase feldspar | 25 to 50% | 50 to 70% | 0 to 50% | 0% |
| Biotite and/or amphibole | 0 to 20% | 20 to 40% | 0 to 30% | 0% |
| Pyroxene | 0% | 0 to 20% | 20 to 75% | 0% to 75% |
| Olivine | 0% | 0% | 0 to 25 % | 25% to 100% |
| Intrusive rock name | Granite | Diorite | Gabbro | Peridotite |
| Extrusive rock name | Rhyolite | Andesite | Basalt | Komatiite |
Figure 2.7.2: Generalized Geologic Map of California
Description