Porphyroid

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. ❋ Arnold Henry Savage Landor (1894)

Pumice and trachyte are the most common rocks around this mountain, and these are augitic or porphyroid. ❋ James Orton (1853)

Dr.T. Sterry Hunt calls them porphyroid trachytes. ❋ James Orton (1853)

The solid products of Pichincha since the Conquest have been chiefly pumice, coarse-grained and granular trachyte, and reddish porphyroid trachyte. ❋ James Orton (1853)

Its lithology is represented in our collection by porous, gray, granular trachyte, fine-grained, compact trachyte, and dark porphyroid trachyte. ❋ James Orton (1853)

The representative products of Antisana are a black, cellular, vitreous trachyte, a fine-grained, tough porphyroid trachyte, and a coarse reddish porphyroid trachyte. ❋ James Orton (1853)

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. ❋ James Orton (1853)

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. ❋ Unknown (1851)

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! ❋ Unknown (2006)