pyroxene

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py·rox·ene

(pī-rŏk′sēn′)

Any of a group of crystalline silicate minerals common in igneous and metamorphic rocks and containing two metallic oxides, as of magnesium, iron, calcium, sodium, or aluminum.

[French pyroxène : Greek puro-, pyro- + Greek xenos, stranger (originally viewed as a foreign substance when found in igneous rocks); see ghos-ti- in Indo-European roots.]

py′rox·en′ic (pī′rŏk-sē′nĭk, -sĕn′ĭk) adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pyroxene

(paɪˈrɒksiːn)

(Minerals) any of a group of silicate minerals having the general formula ABSi2O6, where A is usually calcium, sodium, magnesium, or iron, and B is usually magnesium, iron, chromium, manganese, or aluminium. Pyroxenes occur in basic igneous rocks and some metamorphic rocks, and have colours ranging from white to dark green or black. They may be monoclinic (clinopyroxenes) or orthorhombic (orthopyroxenes) in crystal structure. Examples are augite (the most important pyroxene), diopside, enstatite, hypersthene, and jadeite

[C19: pyro- + -xene from Greek xenos foreign, because it was mistakenly thought to have originated elsewhere when found in igneous rocks]

pyroxenic adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

py•rox•ene

(paɪˈrɒk sin, pə-, ˈpaɪ rɒkˌsin)

n.

any of a group of silicate minerals whose silica tetrahedra are arranged in single chains, usu. with ions of magnesium, iron, and calcium in between, and that constitute many igneous rocks.

[1790–1800; < French; see pyro-, xeno-; orig. conjectured to be a foreign substance when found in igneous rocks]

py`rox•en′ic (-ˈsɛn ɪk) adj.

py·rox·ene

(pī-rŏk′sēn′)

Any of a series of rock-forming minerals consisting of mixtures of calcium, sodium, magnesium, or iron silicates. Pyroxenes vary in color from white to dark green or black and are characterized by a rectangular-shaped cross section. They occur in igneous and metamorphic rocks.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pyroxene

Any of a group of rock-forming silicate minerals.

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Noun

pyroxene - any of a group of crystalline silicate mineral common in igneous and metamorphic rocks

mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

nephelinite - an igneous rock consisting of nepheline and pyroxene

basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene

Translations

pyroxène

pirosseno

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References in periodicals archive ?

Phase-equilibria studies show that, like tholeiites, fractionation of olivine and pyroxene are important in the earliest stages of fractionation of calc-alkalic magmas.

Igneous rock associations 8. Arc magmatism II: geochemical and isotopic characteristics

Rock fragments can be abundant (3-39%) and consist of fresh to weathered grains composed of amphibols, Pyroxene, micas and quartz, sometimes with internal fluidal structures.

Identificacion del Permico Inferior (Autuniense) en el subsuelo de la Cuenca del Ebro, NE de Espana, y sus consecuencias paleogeograficas

Table 1 Representative microprobe analyses of pyroxene phenocrysts Sample No.

Zeolite-bearing trachyandesite from Dobranka, Ceske stredohori Mts.: petrography, geochemistry and amygdale mineralogy

However, there was no sign of internal differentiation seen in pyroxene chemistry (determined by electron microprobe analyses): the composition remained the same in samples taken throughout the flow.

Geological Sciences

Sampling, blasting and mining sequences were also successfully modified to reduce the dilution from higher grades and lower continuity in the pyroxene skarn at the bottom of the Boinas West pit.

Rio Narcea's ongoing growth

Both of these types of feature are hosted within the normal mantle rocks, called peridotites, that are composed mainly of the minerals olivine and pyroxene. Our work focuses on the replacive dunites, which are formed when melt migrating by porous flow, saturated only in olivine, dissolves all the pyroxene from the rock.

Melt extraction from the mantle beneath mid-ocean ridges

This implies that significant fractionation of hornblende ([+ or -] pyroxene) had occurred before and during the process of crustal contamination/magma mixing at depth.

Interaction of the lithospheric mantle and crustal melts for the generation of the Horoz Pluton (Nigde, Turkey): whole-rock geochemical and Sr-Nd-Pb isotopic evidence/Litosfaarilise vahevoo ja maakooretekkega magmade suhted Horozi intrusiooni (Turgi) tekkes kivimi geokeemiliste ning Sr-Nd-Pb isotoopgeoloogiliste andmete alusel

The dominant minerals are plagioclase phenocrysts, quartz, K-feldspar, and hornblende and accessory minerals such as biotite, pyroxene, apatite, sphene, and opaque minerals can be seen in some of these rocks.

Magmatic evolution and compositional characteristics of tertiary volcanic rocks associated with the Venarch manganese mineralization, Sw Qom, Central Iran/Evolucion Magmatica y caracteristicas de composicion en rocas volcanicas terciarias asociadas con la mineralizacion de manganeso en la mina de Venarch, al Suroeste de Qom, en la Region Central de Iran

It should be expected that at greater depths (25 km and deeper), there is an increase in the content of heavy minerals such as garnet and pyroxene (Gorbatsevich et al., 2012).

Density and velocity model of metamorphic rock properties in the upper and middle crystalline crust in the Kola superdeep borehole (SG-3) section

Isotropic gabbros existing in this Ophiolitic melange are seen in northeastern part of the region and Plagioclase and Pyroxene crystals can be spotted in their mineralogy composition; these rocks also have tolerated weak degrees of metamorphism.

The role of structural and petrological elements in mineralization of hontite and magnesite in Ashin-Naein

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