Rhenium is obtained almost exclusively as a by-product of the processing of a special type of copper deposit known as a porphyry copper deposit. From Wordnik.com. [Rhenium] Reference
The principal measured reserves are in the so-called porphyry coppers of the United States and Chile. From Wordnik.com. [The Economic Aspect of Geology] Reference
The porphyry, which is of warm brown or chocolate colour, includes many crystals of lighter coloured felspar, and dark crystals of hornblende. From Wordnik.com. [Gold, Sport, and Coffee Planting in Mysore] Reference
The so-called porphyry copper mines, which now produce more than half the world's copper, are worth looking at in the context of exploitation limits. From Wordnik.com. [Limits to Exploitation of Nonrenewable Resources (historical)] Reference
There was also a very hard variety of granite much used by sculptors called porphyry, a very hard and variegated rock of a mixed purple-and-white colour. From Wordnik.com. [From John O'Groats to Land's End] Reference
If these parts of the composition be less distinct, or if only two of them be visible to the eye, it is termed porphyry, trap, whinstone, moorstone, slate. From Wordnik.com. [The Botanic Garden A Poem in Two Parts. Part 1: the Economy of Vegetation] Reference
Mineral deposit types present on the Fort-Elden property are classified as porphyry and epigenetic characterized by disseminated, vein and breccia hydrothermal systems. From Wordnik.com. [TradingMarkets] Reference
Thefe rocks wiere a kind of porphyry with a yellowifh white. From Wordnik.com. [Travels in Hungary, with a short account of Vienna in the year 1793] Reference
The so-called "porphyry" coppers in Utah, Arizona, Nevada, and New. From Wordnik.com. [The Economic Aspect of Geology] Reference
= Another type of copper deposits in igneous rocks is the disseminated or "porphyry" deposits. From Wordnik.com. [The Economic Aspect of Geology] Reference
The sarcophagus has the shape of that one made of porphyry which is in the Piazza della Ritonda in Rome. From Wordnik.com. [Lives of the Most Eminent Painters Sculptors and Architects Vol. 03 (of 10), Filarete and Simone to Mantegna] Reference
The term "porphyry" as commonly used includes true porphyries, monzonites, granites, and other igneous rocks. From Wordnik.com. [The Economic Aspect of Geology] Reference
Mr. Clarke had many uncut specimens at Zagázig, embedded in a dark gangue, which he called "porphyry," as opposed to the limestone which bears the silicate of copper. From Wordnik.com. [The Land of Midian — Volume 2] Reference
"porphyry" as among the most precious of the harder massive stones. From Wordnik.com. [The Two Paths] Reference
"porphyry": Poetic use: a beautiful and valuable purple stone (OED). From Wordnik.com. [Sappho and Phaon] Reference
| Page 874: 'of porphyry and and other rare' replaced with |. From Wordnik.com. [Museum of Antiquity A Description of Ancient Life] Reference
The west arm of the pier is built on a vein of felspar porphyry, visible at low water. From Wordnik.com. [The Cornwall Coast] Reference
The pavement was of polished marble, and columns of porphyry supported a paneled dome. From Wordnik.com. [The Martyr of the Catacombs A Tale of Ancient Rome] Reference
The colossal Egyptian statues are generally of granite, basalt, porphyry, or sandstone. From Wordnik.com. [Museum of Antiquity A Description of Ancient Life] Reference
Umè's mirror; and to the west the peak of Fuji, a porphyry cone against the sunset splendor. From Wordnik.com. [The Dragon Painter] Reference
Underneath the chancel arch is the sepulchre of Wellington, of Cornish porphyry, plain and unadorned. From Wordnik.com. [Bell's Cathedrals: The Cathedral Church of Saint Paul An Account of the Old and New Buildings with a Short Historical Sketch] Reference
Sarcophagi or coffins of bronze, of porphyry and other rare marbles contained the bodies of the dead. From Wordnik.com. [Museum of Antiquity A Description of Ancient Life] Reference
One of its principle monuments, a huge porphyry column, still stands and is known as the "Burnt Column.". From Wordnik.com. [Procopius History of the Wars, Books V. and VI.] Reference
Red Rivers, which are tinged with red mud, derived from rocks of porphyry and red gypseous clays in 'the far west.'. From Wordnik.com. [The Harvard Classics Volume 38 Scientific Papers (Physiology, Medicine, Surgery, Geology)] Reference
As we came nearer to the eastern mountains, we found innumerable and huge blocks of porphyry rock scattered over the ground. From Wordnik.com. [Byeways in Palestine] Reference
The most striking feature of the interior is the forest of porphyry, jasper, and marble pillars supporting open Moorish arches. From Wordnik.com. [Early European History] Reference
Oriental, lived to see its churches turned into mosques, below which lie, broken and untended, the porphyry monuments of Paleologue and. From Wordnik.com. [From a Terrace in Prague] Reference
They consist chiefly of varieties of marble and alabaster, agates of different shades, chalcedony, jasper, lapis lazuli, and red porphyry. From Wordnik.com. [The South of France—East Half] Reference
The Solitaire showed what appeared to be a contact vein, with walls of porphyry and limestone in a ledge thirty feet wide in places, containing. From Wordnik.com. [Scientific American Supplement, No. 360, November 25, 1882] Reference
Such huge piles of porphyry I had not seen since those of the coast of Peterhead and Buchan, lashed by the great billows coming from the Baltic Sea. From Wordnik.com. [Byeways in Palestine] Reference
Or again to wander, like a happy child of Asiatic climes in gardens of sycamores, where young sultanas bathe and disport themselves in basins of porphyry. From Wordnik.com. [French and Oriental Love in a Harem] Reference
The outside of Sancta Sophia is somewhat disappointing, but the interior, with its walls and columns of polished marble granite and porphyry, is magnificent. From Wordnik.com. [Early European History] Reference
Some idea may be formed of the immense labor with which this building was constructed from measurements made of several of the masses of porphyry that compose it. From Wordnik.com. [The Prehistoric World; or, Vanished races] Reference
The beds also were of gold and silver, placed in order upon a floor paved with porphyry and white marble: which was embellished with painting of wonderful variety. From Wordnik.com. [The Bible, Douay-Rheims, Book 19: Esther The Challoner Revision] Reference
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