| 1. | Most are volcanic and extrusive in nature, rather than tectonic.
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| 2. | Andesite can be considered as the extrusive equivalent of plutonic diorite.
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| 3. | Granodiorite is felsic to intrusive igneous equivalent of the extrusive igneous dacite.
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| 4. | The ridges may be volcanotectonic features, composed of extrusives along fissures.
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| 5. | This extrusive igneous rock is known from only two geological formations worldwide.
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| 6. | The extrusive igneous rock equivalent of granite is rhyolite.
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| 7. | Generally speaking, phaneritic implies an intrusive origin; aphanitic an extrusive one.
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| 8. | Examples of extrusive rocks include basalt, rhyolite, andesite, obsidian and pumice.
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| 9. | Phonolite is the fine-grained extrusive equivalent.
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| 10. | Unlike the Sacramento Mountains, the neighboring Sierra Blanca is an extrusive igneous complex.
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