A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90°, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.
A group of silicate minerals, of simple or complex composition, which have essentially the same crystal form and many similar physical properties. Chiefly silicates of iron, calcium, and magnesium.
a group of rock forming silicates commonly containing iron, magnesium, calcium, aluminium and sodium. No terms yet - please contact if there is one you would like to see added.
A group of dark rock forming silicate minerals having the general formula: ABSi2O6, where A may represent Ca, Na, Mg, or Fe and B may be Mg or Fe. Pyroxenes are a common constituent of igneous rocks. Pyroxenes can crystalize in the orthorhombic (orthopyropxene) or monoclinic (clinopyroxene) crystal systems.
(pie roks' een) - A major group of silicate minerals of which two end members are enstatite - MgSiO3 and ferrosilite - FeSiO3.
A group of rock-forming ferro-magnesian minerals, dark, and superficially similar to amphiboles. Pyroxenes crystallize at higher temperatures than amphiboles, and commonly have a square or rectangular cross-section while amphiboles show angular and prismatic (even needle-like) cross-sections. Augite is a common pyroxene.
The name for a group of silicate minerals, with a chain structure. Pyroxenes are typically found in basic rocks.
any of a group of crystalline silicate mineral common in igneous and metamorphic rocks
a kind of silicate mineral
a silicate mineral containing two metal oxides: CaMgSi2O6,CaFeSi2O6,(Mg,Fe)SiO3
A dark greenish-black mineral that is an essential mineral of many mafic igneous rocks. A group of common rock-forming minerals containing silicon, oxygen, aluminum, and some combination of the metals iron, magnesium, and calcium. It usually exists as irregular, blocky masses. Pyroxenes are hard, blocky in appearance, and break along flat, reflective surfaces that meet at right angles.
one of a number of minerals composed of (magnesium, iron, calcium, sodium) plus (magnesium and/or iron or aluminum) silicate.
A family of minerals with the general chemical composition calcium, magnesium, iron silicate.
A family of silicate minerals with a general formula Y(Si,Al) where Y = Ca, Na, Mg, Fe, Mn). Pyroxenes occur in both igneous and metamorphic rocks. See also diopside.
a mineral group composed of varying amounts of calcium, magnesium, iron, and aluminum in a silica oxide (Si2O6) base
A common, dark-coloured, silicate mineral which contains iron and magnesium and is a common constituent of gabbro, anorthosite and some ultramafic rocks.
A black coloured mineral common in basalt and andesite.
complex silicate minerals containing iron, magnesium, and calcium.
One of a number of 5i04 silicate minerals common in meteorites
any group of crystalline silicateminerals common in igneous and metamorphic rocks and containing two metallic oxides, as of magnesium, iron, or calcium - BACK
a common mineral in igneous rocks, containing calcium, magnesium, iron, silicon, and oxygen.
any of a group of silicate minerals, usually calcium, magnesium and iron silicate, often found in igneous rocks. [AHDOS
The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. They share a common structure comprised of single chains of silica tetrahedra and they crystalise in the monoclinic and orthorhombic system. Pyroxenes have the general formula XY(Si,Al)2O6 (where X represents calcium, sodium, iron+2 and magnesium and more rarely zinc, manganese and lithium and Y represents ions of smaller size, such as chromium, aluminium, iron+3, magnesium, manganese, scandium, titanium, vanadium and even iron+2).
