| 11. | Tephrite is foidal basalt with essential calic plagioclase but without essential olivine.
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| 12. | Anorthosites form in plutons and are composed mostly of plagioclase.
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| 13. | The plagioclase phenocrysts occasionally reach a grain-size of 10 millimeters.
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| 14. | At the top left is a distinct phenocryst of plagioclase . ]]
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| 15. | Argillic assemblages include kaolinite replacing plagioclase and montmorillonite replacing amphibole and plagioclase.
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| 16. | Argillic assemblages include kaolinite replacing plagioclase and montmorillonite replacing amphibole and plagioclase.
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| 17. | The rhyodacite is characterized by phenocrysts of plagioclase, quartz and biotite.
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| 18. | Strongly-zoned plagioclase with sieve texture also occurs in those rocks.
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| 19. | Plagioclase is the main component of most lavas, with subordinate clinopyroxene.
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| 20. | It contains biotite, orthopyroxene, plagioclase and smaller amounts of quartz.
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