Porphyroid



[pawr-fuh-roid] /ˈpɔr fəˌrɔɪd/

noun
1.
a rock resembling .
2.
a sedimentary rock that has been metamorphosed so as to leave some original crystals in a fine-textured, layered matrix.
/ˈpɔːfɪˌrɔɪd/
adjective
1.
(of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
noun
2.
a metamorphic rock having this texture

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