Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Metamorphic rock having porphyritic texture.
from The Century Dictionary.
- noun A sedimentary rock, originally (in some cases at least) a clay slate, or quartzite, which has been altered by dynamic metamorphism or by some other metamorphic agency so as to take on a slaty and more or less perfectly developed porphyritic structure.
Etymologies
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Examples
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Most beautiful marble of various colours is to be found, and also enormous quantities of mica and amianth; porphyry and porphyroid granite, carbonated and hydroxided iron, argillaceous schist, mica schist.
Across Unknown South America Arnold Henry Savage Landor 1894
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Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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The solid products of Pichincha since the Conquest have been chiefly pumice, coarse-grained and granular trachyte, and reddish porphyroid trachyte.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark porphyroid trachyte.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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The representative products of Antisana are a black, cellular, vitreous trachyte, a fine-grained, tough porphyroid trachyte, and a coarse reddish porphyroid trachyte.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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Dr.T. Sterry Hunt calls them porphyroid trachytes.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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There is a hot spring on the north side, and an immense amount of débris covers the slope below the snow-limit, consisting chiefly of fine-grained, iron-stained trachyte and coarse porphyroid gray trachyte; very rarely a dark vitreous trachyte.
The Andes and the Amazon Across the Continent of South America James Orton 1853
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It is important to geology not to confound the modern currents of lava, the heaps of basalt, green-stone, and phonolite, dispersed over the primitive and secondary formations, with those porphyroid masses having bases of compact feldspar, * which perhaps have never been perfectly liquified, but which do not less belong to the domain of volcanoes.
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It is important to geology not to confound the modern currents of lava, the heaps of basalt, green-stone, and phonolite, dispersed over the primitive and secondary formations, with those porphyroid masses having bases of compact feldspar, * which perhaps have never been perfectly liquified, but which do not less belong to the domain of volcanoes.
Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Alexander von Humboldt 1814
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Road and cried Abies Magnifica! not, noble fir?) a quarter of nine, imploring his resipiency, saw the infallible spike of smoke’s jutstiff punctual from the seventh gable of our Quintus Centimachus’ porphyroid buttertower and then thirsty p.m. with oaths upon his lastingness (En caecos harauspices!
Finnegans Wake 2006
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