PORPHYRITIC • DICTIONARY ONE.COM • Definition of Porphyritic

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/pˌɔrfərˈɪtɪk/ Listen

Porphyritic

adjective

(of rocks) consisting of porphyry or containing large crystals in a fine groundmass of minerals.

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Etymology of 'Porphyritic'

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"Porphyritic" Quotes from Famous Books

... of granite, i.e., felspar, quartz, and mica, did not exist before vegetables, and that these minerals and their aggregation into granite were the result of slow deposition in the ocean.[80] He goes so far as to assert that the porphyritic rocks were not thus formed in the sea, but that they are the result of deposits carried down by streams, especially torrents flowing down from mountains. Gneiss, he thinks, resulted from the detritus of granitic rocks, by ...

— Lamarck, the Founder of Evolution - His Life and Work • Alpheus Spring Packard

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... base in a misty raiment of purple, the royal hill lifted above the valley an Olympian crest of porphyritic rock into the fathomless blue. Here not Jupiter and his court looked serenely down upon the struggling race, "indifferent from their awful height," but a dark-hued god, in Aztec vestments, gazed beyond the meadows to the floating flower ...

— The Strollers • Frederic S. Isham

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Words linked to "Porphyritic" : porphyry, porphyritic rock