| 21. | The two oldest domes contain several percent phenocrysts; the rest are essentially aphyric.
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| 22. | The calcium sulfate, anhydrite, was present as phenocrysts in the erupted tephra.
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| 23. | The basalt comprises phenocrysts of clinopyroxene and labradorite.
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| 24. | Phenocrysts include biotite, Si magmas, while higher Si magmas also contain sanidine.
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| 25. | Some phenocrysts show evidence of a complex history.
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| 26. | Porphyritic dacites contain blocky highly zoned plagioclase phenocrysts and / or rounded corroded quartz phenocrysts.
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| 27. | Porphyritic dacites contain blocky highly zoned plagioclase phenocrysts and / or rounded corroded quartz phenocrysts.
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| 28. | Clinopyroxene ( augite ) and olivine are common as phenocrysts and in the tholeiitic basalt.
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| 29. | They contain glass, microliths and phenocrysts, and have a composition similar to phenocrysts.
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| 30. | They contain glass, microliths and phenocrysts, and have a composition similar to phenocrysts.
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