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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
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.
Orthopyroxenes and clinopyroxenes are highly magnesian with an Mg number ranging 0.89 to 0.96 (geometric mean: 0.92; standard deviation: 0.02) and 0.89 to 0.98 (geometric mean: 0.93; standard deviation: 0.02), respectively. Orthopyroxenes and clinopyroxenes have a high content of Al 2 O 3, at 3.13–5.30 wt.% and 1.79–6.45 wt.%, respectively.
The pyroxenes (commonly abbreviated Px) are a group of important rock-forming inosilicate minerals found in many igneous and metamorphic rocks.
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Jan 15, 2022 · Orthopyroxene ( (Mg, Fe, Ca) (Mg, Fe, Al) (Si, Al) 2 O 6) is a major rock-forming mineral in subducting slabs, and its metastable phases are considered to be related to the stagnation of slabs which are located at the transition zone due to its low density in comparison to other major slab minerals.
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- 127, Issue1
- 15 January 2022
Jul 1, 2021 · Abstract. The MgGeO 3 system is a low-pressure analog for the Earth-forming (Mg,Fe)SiO 3 system and exhibits recoverable orthopyroxene, clinopyroxene, and ilmenite structures below 6 GPa.
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