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porphyries
Variant of porphyry
noun pl. porphyries
- Historical an Egyptian rock with large feldspar crystals contained in a purplish groundmass
- any igneous rock with large, distinct crystals, esp. of alkali feldspar, embedded in a fine-grained matrix
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
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