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Geology of Mount ShastaFigure 5 |
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Geology of Mount ShastaFigure 5 |
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| Rock type: | BASALT | BASALTIC ANDESITE | ANDESITE | DACITE | |
| Wt. % silica: | 47 - 52 | 52 - 57 | 57 - 63 | 63 - 72 | |
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Olivine |  |
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| Hypersthene |  |
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| Augite |  |
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| Hornblende |  |
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| Biotite |  |
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| Plagioclase |  |
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| Quartz |  |
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| Magnetite/ilmenite |  |
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| Figure 5: Classification chart for volcanic rocks found in the Mount Shasta area. Silica contents and typical phenocryst assemblages (shown by colored bars) are given for each rock type. Hand-sample and thin-section photographs of a sample of each rock are linked to its name at the top of the column. |
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