Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
porphyry .
Etymologies
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Examples
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The Serra do Mar Mountain Chain is made up of ore-Cambrian granite porphyries and gneiss magma.
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Slates, chalkstones, limestones, granites and porphyries form these mountains.
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The lower beds of the Peuquenes ridge, and of the several great lines to the westward of it, are composed of a vast pile, many thousand feet in thickness, of porphyries which have flowed as submarine lavas, alternating with angular and rounded fragments of the same rocks, thrown out of the submarine craters.
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The normal dark-green traps and burnished red porphyries and grits were sparsely clad with the Shauhat and the Yasár trees, resembling the
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The lower beds of the Peuquenes ridge, and of the several great lines to the westward of it, are composed of a vast pile, many thousand feet in thickness, of porphyries which have flowed as submarine lavas, alternating with angular and rounded fragments of the same rocks, thrown out of the submarine craters.
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That to the south showed us a perfectly familiar formation; conglomerates of water-rolled pebbles in the lower levels, and hills of the normal dark porphyries, with large quartz-seams of many colours trending in every direction.
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To this period belong the felspar, syenites, and porphyries.
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They attract attention only by their material, red boulders being used instead of the green porphyries of the hills; and the now desolate spot shows no signs of water or of palm-groves.
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They consist of talcose-schiste, bluish-grey limestone, talc in beds, serpentine, black marble similar to the oldest in the Alps, quartz, feldspar, and porphyries.
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These porphyries are pierced by greenstone two or three feet thick, and the granites are intersected by numerous veins of amphibolite
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