| 31. | Agates and thunder eggs are found in the rhyolite layers.
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| 32. | Hydrothermally altered rhyolites contain rutile and secondary silicates in veins.
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| 33. | The rhyolites too show evidence of flow structures and bedding.
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| 34. | Ilmenite, magnetite and quartz are found in the rhyolite.
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| 35. | Guallatiri has erupted andesite, dacite and rhyolite, with dacite dominating.
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| 36. | Partial melting may also be the source of the rhyolites.
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| 37. | The extrusive igneous rock equivalent of granite is rhyolite.
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| 38. | Eruptions of rhyolite are relatively rare compared to eruptions of less felsic lavas.
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| 39. | Mount Coonowrin ( Crookneck ) ( 377m ) is composed of alkali rhyolite.
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| 40. | Late Variscan volcanic rocks occur in the Fichtel Mountains as layers of rhyolite.
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