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porphyroid
[ pawr-fuh-roid ]
noun
- a rock resembling porphyry.
- a sedimentary rock that has been metamorphosed so as to leave some original crystals in a fine-textured, layered matrix.
porphyroid
/ ˈpɔːfɪˌrɔɪd /
adjective
- (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
noun
- a metamorphic rock having this texture
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Word History and Origins
Origin of porphyroid1
First recorded in 1790–1800; porphyr(y) + -oid
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Example Sentences
Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
From Project Gutenberg
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