| 11. | Biotite is virtually absent, but zircon is very common.
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| 12. | Biotite lamprophyres ( minettes ) are oriented in the north west direction.
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| 13. | The biotite has aligned itself parallel to sigmoidal shear bands.
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| 14. | The rhyodacite is characterized by phenocrysts of plagioclase, quartz and biotite.
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| 15. | It contains biotite, orthopyroxene, plagioclase and smaller amounts of quartz.
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| 16. | Microlites in the Lake unit rocks include biotite, plagioclase and spinel.
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| 17. | Dacites have biotite, hornblende, plagioclase and quartz phenocrysts.
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| 18. | Rocks are porphyritic and contain hornblende as well as biotite or pyroxene.
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| 19. | These include the amphibole, biotite, feldspar and zircon.
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| 20. | Minerals in its rocks include amphibole, biotite, orthopyroxene and plagioclase.
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