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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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更新时间:2025/3/22 6:16:46