American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of a group of igneous rocks composed mainly of olivine and various pyroxenes and having a granitelike texture.
Century Dictionary and Cyclopedia
- n. A rock composed essentially of olivin, with which are usually associated more or less of one or more of the minerals enstatite, diallage, augite, magnetite, chromite, and picotite. Linthologists are by no means agreed in regard to the nomenclature of the varieties of peridotite. M. E. Wadsworth distinguishes the following: dunite, composed almost entirely of olivin, with a few grains of picotite, magnetite, or some other accessory mineral: saxonite, a variety consisting of olivin and enstatite; lherzolile, of olivin with enstatite and diallage; buchnerite, of olivin, enstatite, and augite; eulysite, of olivin and diallage; picrite, of olivin and augite. Of these varieties, the first four have been found in meteorites as well as in terrestrial rocks; the others, so far as known, are exclusively terrestrial. Olivin passes readily into serpentine; hence many olivin rocks are found more or less completely altered into that mineral, so that the distinction between olivin and serpentine rocks is one not easily preserved. Peridotite is known to be in some cases an eruptive rock, and is generally supposed to have been such in all cases. That most serpentine rocks are the result of the alteration of some peridotic material is also generally conceded; that serpentine may have been produced in some other way is possible, but has not been distinctly proved.
- n. geology, mineralogy A rock consisting of small crystals of olivine, pyroxene and hornblende; the major constituent of the Earth's mantle.
GNU Webster's 1913
- n. (Min.) An eruptive rock characterized by the presence of chrysolite (peridot). It also usually contains pyroxene, enstatite, chromite, etc. It is often altered to serpentine.
- n. a dark coarse-grained igneous rock consisting principally of olivine
- From peridot + -ite. (Wiktionary)
“C peridotite and dunite the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.”
“Geologist Peter Kelemen and fellow scientists from the Earth Institute at Columbia University went to Oman and discovered that a special kind of rock called peridotite has the potential to suck up billions of pounds of CO2.”
“It is a unique type of rock, peridotite, which is normally found only much deeper in the earth, but which juts up to the mantel in the Atlantic massif.”
“Their studies show that the rock, known as peridotite, reacts naturally at surprisingly high rates with CO2 to form solid minerals-and that the process could be speeded a million times or more with simple drilling and injection methods.”
“The studies show that the rock, known as peridotite, reacts naturally at high rates with carbon dioxide (CO2) to form solid minerals - and that the process could be speeded with simple drilling and injection methods.”
“The researchers have shown that rock formations called peridotite, which are found in Oman and several other places worldwide, including California and New Guinea, produce calcium carbonate and magnesium carbonate rock when they come into contact with carbon dioxide.”
“The upper one, from 67. 0m to 70. 3m is a medium grained, dark grey-green to grey, lineated, biotitized, foliated metagabbroic peridotite which is weakly garnetiferous.”
“The approach consists of drilling into a layer of peridotite which is fractured and heated.”
“C) peridotite and dunite (the upper mantle is composed of ultramafic rock called peridotite which is mostly olivines and pyroxenes.”
“Besides the dyke swarms, the northern section is composed mainly of serpentinised peridotite and gabbro masses, although there are small areas of extrusive volcanic rocks.”
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