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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 ...
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
Orthopyroxenes are a group of minerals ranging from pure MgSiO3 (enstatite) to pure FeSiO3 (ferrosilite). Bronzite and hypersthene are orthopyroxenes mid-way between these two end members. As the particular orthopyroxene mineral described is not always identified, all reported orthopyroxene occurrences are grouped together. Orthopyroxenes are relatively widespread as a primary mineral in ...
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 ...
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Orthopyroxene in a Spinel Peridotite Xenolith from Kilbourne Hole, New Mexico These photos show mostly orthopyroxene (light clear to green, PP; gray interference color , XP). Several small grains of clinopyroxene (2nd order yellow to blue interference colors , XP) are also also present -- mostly along the left side of the photos.
82fde655-7222-4c21-8eb6-d992ac0a87b7 (as Orthopyroxene) e7ab19ec-462b-48f9-95b8-64a65121413c (as Orthopyroxene Subgroup)
Orthopyroxene occurs mostly as small grains in the sample matrix and as inclusions and exsolution lamellae in clinopyroxene, but several large exsolved orthopyroxenes are observed in samples 119-17 and 119-19 (Figure 13.2B ). Only in sample 119-19 (garnet orthopyroxenite) is Opx a major constituent and coarse grained.
