from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Metamorphic rock having porphyritic texture.
from The Century Dictionary and Cyclopedia
- n. 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.
Sorry, no etymologies found.
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.
Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid.
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.
Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark 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.
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.
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.
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!
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