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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.
- The Editors of Encyclopaedia Britannica
Piroksen. Contoh piroksenit, batuan yang sebagian besar terdiri dari mineral piroksen. Piroksen adalah sebuah kelompok mineral inosilikat yang banyak ditemukan pada batuan beku dan batuan metamorf. Strukturnya terdiri dari rantai tunggal silika tetrahedral dan mengkristal monoklinik dan ortorombik.
Orthopyroxene is the most characteristic and important ferromagnesian mineral of the rocks of the charnockite series and is a typical mineral of the granulite facies of regional metamorphism. It is also produced in medium-grade, thermally metamorphosed, argiliaceous rock by the breakdown of chlorite .
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82fde655-7222-4c21-8eb6-d992ac0a87b7 (as Orthopyroxene) e7ab19ec-462b-48f9-95b8-64a65121413c (as Orthopyroxene Subgroup) References for OrthopyroxeneHide
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.
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.
