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The Daily Insight

How to pronounce porphyry

Author

Natalie Ross

Published Feb 19, 2026

What does porphyry mean?

feldspar minerals

(A porphyry is an igneous rock containing conspicuous crystals, called phenocrysts, surrounded by a matrix of finer-grained minerals or glass or both.) In most rocks, both alkali and plagioclase feldspars occur as irregularly shaped grains with only a few or no crystal faces.

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