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ALH 84001
- ALH 84001 is an extraterrestrial example of an orthopyroxenite. It is an achondrite meteorite from Mars. 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.
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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 .
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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
Pyroxenite. 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.
Orthopyroxenes are relatively widespread as a primary mineral in gabbroic and ultramafic rocks where they form with augite, olivine and plagioclase. Orthopyroxene may occur in high grade metamorphic rocks. It is essential in the granitic gneisses called charnockites, and may be found in pyroxene granulites and metamorphosed iron formations.
Excellent examples are found in many areas, including Arequipa, Wilson Lake, the Labwor Hills, Sutam, Stanovoy, the Eastern Ghats, the Mather Supracrustals, In Ouzzal and the Uweinat-Kamil inlier.
Apr 23, 2023 · Pyroxenite is an ultramafic igneous rock that contain pyroxene group minerals such as augite, diopside, hypersthene, bronzite or enstatite. This is a coarse-grained rock and that contains at least 90 percent pyroxene minerals.
Pyroxene > Orthopyroxene. A petrological term for Orthopyroxene Subgroup. Non-essential minerals - these minerals are common, sometimes major components, but are not always present: Olivine. Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ...
