| 1. | Crystalline rocks with obsidian's composition include granite and rhyolite.
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| 2. | Rhyolite began to decline before the final closing of the mine.
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| 3. | These rocks have a light colour, due to the rhyolite.
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| 4. | The Coso Volcanic Field is best known for its Pleistocene rhyolite.
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| 5. | Jagged brown-grey columns of rhyolite rear up everywhere .'
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| 6. | The eruptive products range from basaltic andesite to rhyolite and rhyodacite.
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| 7. | Rhyolites are in the form of stubby lava flows and domes.
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| 8. | Examples of aphanitic igneous rock include basalt, andesite and rhyolite.
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| 9. | Most of the rhyolites are characterized by large amounts of pyroxene.
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| 10. | One rhyolite unit appears to overlie the McDougall Brook Granite formation.
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