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A hard igneous rock containing crystals, usually of feldspar, in a fine-grained, typically reddish groundmass.
- ‘The sedimentary beds are composed mainly of poorly sorted subangular to rounded clasts of felsite and rhyolite porphyry that are typically a red color.’
- ‘In 2000, fifty porphyry deposits had been identified in Chile, with reserves of 400 million tons of copper!’
- ‘The reference to emerald stone probably indicates color rather than medium, which suggests that the statue was carved of green basalt, granite, porphyry, or serpentine.’
- ‘Other possible occurrences include porphyry copper deposits that contain enargite at depth, such as Chuquicamata, Chile.’
- ‘Most beds are almost monomictic, comprising quartz-feldspar porphyry clasts, whereas some other beds are highly heterogeneous.’
- ‘A porphyry obscures the contact between the Cross Slieve Group and the Red Arch Formation.’
- ‘They also noted that much kaolin is in or near decomposed porphyry bodies that overlie the largest ore shoots in the Leadville Dolomite.’
- ‘The fault places massive fractured greenstones over relatively undeformed feldspar andesite porphyry.’
- ‘This rare work of porphyry, limestone, serpentine and onyx is unique north of the Alps.’
- ‘Although closely associated with plutonic igneous rocks, porphyry mineralization commonly encompasses large volumes of the surrounding host rocks to the intrusion.’
- ‘Some of the finest cuprite specimens ever found have come from the oxidized zones of several of Arizona's porphyry copper and related deposits.’
- ‘The mine workings occupy much of the west side of an isolated low hill composed mainly of light-colored volcanic rock, described as felsite porphyry or trachyte, highly altered to clay minerals.’
- ‘During this time, many of the district's steeply dipping, northeast-trending faults were intruded by narrow, granodiorite porphyry dikes.’
- ‘This mine, just north of the Mount Tolman porphyry molybdenum-copper deposit, was once Washington State's sole fluorite producer, with 235 tons shipped between 1918 and 1940.’
- ‘At least two Eocene feldspar porphyry dykes or sills intrude Tsa da Glisza, and appear to have followed the same planes of weakness as the aplite dykes.’
- ‘The ore is associated with plagiogranite porphyry of Mesozoic age.’
- ‘This is particularly well known to collectors familiar with porphyry copper deposits of Arizona, New Mexico, and Utah.’
- ‘The Main Channel conglomerate is made up of a variety of well-rounded felsite, granophyre, and quartz-feldspar porphyry pebbles, suggesting a geologically diverse source terrane.’
- ‘The Henry Mountains consist of multiple intrusions of quartz-monzonite porphyries (predominantly plagioclasehornblende rocks) that were emplaced from 29.2 to 20.0 million years ago into a thick sequence of Mesozoic sediments.’
- ‘Final polishing will only succeed on the hardest of stones, such as granite, porphyry, and gemstones, and again abrasive materials will be used for this, including abrasive powders or salts.’
Late Middle English: via medieval Latin from Greek porphuritēs, from porphura ‘purple’.
(c.232–303), Neoplatonist philosopher; born Malchus. He was a student of Plotinus, whose works he edited after the latter's death.
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