Usually means: Mineral crystal larger than matrix.
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We found 8 dictionaries that define the word porphyroblast:

General (6 matching dictionaries)
  1. porphyroblast: Merriam-Webster
  2. porphyroblast: Oxford Learner's Dictionaries
  3. porphyroblast: Wiktionary
  4. porphyroblast: Dictionary.com
  5. Porphyroblast: Wikipedia, the Free Encyclopedia
  6. porphyroblast: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. porphyroblast: Encyclopedia

Science (1 matching dictionary)
  1. Illustrated Glossary of Geologic Terms (No longer online)

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Definitions from Wiktionary (porphyroblast)

▸ noun:  (geology) A relatively large crystal within a metamorphic rock

Similar:
metacrystal, porphyry, porphyre, poikiloblast, porphyrite, porphyroid, xenoblast, phenocryst, microphenocryst, megacryst, more...

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Similar:
metacrystal, porphyry, porphyre, poikiloblast, porphyrite, porphyroid, xenoblast, phenocryst, microphenocryst, megacryst, more...



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