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Porphyry N Hard Igneous Rock Reddish Groundmass Feldspar

Word porphyry
Definition n. A hard igneous rock in a reddish groundmass with feldspar crystals.
Sentence [Nero's] coffin, of white porphyry, stands there in the Domitian family tomb behind a rail of Thasian stone and overshadowed by an altar of Luna marble.
Source Suetonius, The Twelve Caesars, Nero, p. 239

Image: By Gunnar Ries Amphibol - Own work (own photo), CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=3853254

Tags: language::english, topic::vocabulary

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