pyroxene


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py·rox·ene

 (pī-rŏk′sēn′)
n.
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.

pyroxene

(paɪˈrɒksiːn)
n
(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

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.

pyroxene

Any of a group of rock-forming silicate minerals.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
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.
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.
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.
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.
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.
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).
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.