| 21. | The intrusive quartz-porphyries are equally well described as granite-porphyries.
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| 22. | No illustrations or diagrams occur in editions of Porphyry's original work.
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| 23. | Pro-demiurgic Neoplatonic philosophers included Porphyry, Proclus, Iamblichus of Chalcis.
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| 24. | The triumphal arch is flanked by two porphyry columns.
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| 25. | The deposit mined was a copper-gold porphyry.
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| 26. | The deposit is complex but has the general characteristics of a porphyry copper.
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| 27. | Rocks from the Cretaceous include syenite porphyry sills and dykes near Cygnet around.
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| 28. | Beyond the tomb there is a short, Roman pillar of Egyptian porphyry.
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| 29. | Sheets of porphyry are mixed in with the granite.
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| 30. | The hill is composed of feldspar porphyry, its summit of compacted feldspar.
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