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出典:Wiktionary
出典:『Wiktionary』 (2025/10/31 19:30 UTC 版)
porphyroblast (plural porphyroblasts)
出典:Wikipedia
出典:『Wikipedia』 (2010/09/21 22:26 UTC 版)
A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained groundmass. Porphyroblasts are commonly euhedral crystals, but can also be partly to completely irregular in shape.
porphyroblast