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Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene and a type of pyroxenite. It can have up to a few percent of olivine and clinopyroxene . This ternary diagram shows the orthopyroxenites as a function of olivine, clinopyroxene and ...
A sample of the orthopyroxenite meteorite ALH84001. Pyroxenite is an ultramafic igneous rock consisting essentially of minerals of the pyroxene group, such as augite, diopside, hypersthene, bronzite or enstatite. Pyroxenites are classified into clinopyroxenites, orthopyroxenites, and the websterites which contain both types of pyroxenes (see ...
orthopyroxene, any of a series of common silicate minerals in the pyroxene family. Orthopyroxenes typically occur as fibrous or lamellar (thin-plated) green masses in igneous and metamorphic rocks and in meteorites. These minerals differ in the ratio of magnesium to iron in the crystal structure; their composition ranges from pure magnesium ...
- The Editors of Encyclopaedia Britannica
Pyroxene. Pyroxene ( diopside) crystals from Afghanistan. The pyroxenes (commonly abbreviated Px) are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks. Pyroxenes have the general formula XY (Si,Al)2O6, where X represents calcium (Ca), sodium (Na), iron (Fe (II)) or magnesium (Mg) and more rarely ...
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A pyroxenite is an ultramafic plutonic rock consisting of ≫60% pyroxene (either clino- or orthopyroxene, or both). Other phases include olivine, hornblende, micas, garnet, feldspar, spinel, ilmenite, and sulfides. They have a gradational relationship with peridotites. The root names reflect the proportions of ortho- and clinopyroxene, and ...
Download reference work entry PDF. The orthopyroxenes are an important series of rock-forming minerals. They are the orthorhombic members of the pyroxene group of silicates and consist essentially of a simple chemical series of (Mg,Fe)SiO 3 minerals, in contrast with the larger subgroup of monoclinic pyroxenes ( clinopyroxenes , q.v.) which ...
Mineralogy of Orthopyroxenite Hide. Essential minerals - these are minerals that are required within the classification of this rock: Pyroxene > Orthopyroxene. A petrological term for Orthopyroxene Subgroup. Non-essential minerals - these minerals are common, sometimes major components, but are not always present: Olivine.
