| 21. | Rock types include trachyandesite, trachyte, syenite and amphibole-biotite granite.
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| 22. | The reaction rim constituted by amphibole and / or biotite is commonly observed.
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| 23. | Biotite occurs in some of these rocks, and melanite also is present.
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| 24. | The spots are darker, containing cordierite and biotite.
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| 25. | Mineralogically the fine-grained phenocrysts consist of quartz, feldspars and biotite.
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| 26. | Under these conditions, new minerals like biotite, diopside and scapolite grew.
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| 27. | Biotite and quartz for instance were broken microgranitic apophyses.
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| 28. | The biotite is typically in clots or short streaks.
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| 29. | These rocks contain hydrous minerals biotite and hornblende partially resorbed in magmatic process.
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| 30. | Minerals include apatite, biotite, clinopyroxene, plagioclase, quartz and titanite.
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