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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
/ ˈɔːɪˌɔɪ /
adjective
- (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
noun
- a metamorphic rock having this texture
51Թ History and Origins
Origin of porphyroid1
Example Sentences
Dr. T. Sterry Hunt calls them porphyroid trachytes.
The solid products of Pichincha since the Conquest have been chiefly pumice, coarse-grained and granular trachyte, and reddish porphyroid trachyte.
The representative products of Antisana are a black, cellular, vitreous trachyte, a fine-grained, tough porphyroid trachyte, and a coarse reddish porphyroid trachyte.
Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark porphyroid trachyte.
Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
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