| 单词 | porphyroblast |
| 释义 | por·phyr·o·blast (pôr-fîrə-blăst′)n. A large crystal that is surrounded by a fine-grained matrix in a metamorphic rock and forms from the recrystallization of existing mineral crystals during metamorphism. [PORPHYR(Y) + —BLAST.] |
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