Advertisement
Advertisement
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
/ ˈ±èɔ˴Úɪˌ°ùɔɪ»å /
adjective
- (of metamorphic rocks) having a texture characterized by large crystals set in a finer groundmass
noun
- a metamorphic rock having this texture
˜yÐÄvlog 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.
Advertisement
Advertisement
Advertisement
Advertisement
Browse