pyroxene(redirected from Alalite)
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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.
(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]
py•rox•ene(paɪˈrɒk sin, pə-, ˈpaɪ rɒkˌsin)
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.
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.
Any of a group of rock-forming silicate minerals.
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|Noun||1.||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