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 diagram below).

A pyroxenite with >90% clinopyroxene.

Clinopyroxene Subgroup: Mineral information, data and localities. This page is currently not sponsored. Click here to sponsor this page. A subgroup name for monoclinic Pyroxene Group minerals. Compare Orthopyroxene Subgroup. The most widespread members include aegirine, augite, hedenbergite and diopside. Compare UM2004-50-SiO:AlFeGd.

• Form: Form stubby prisms elongate along the c-axis, basal sections are 4 or 8 sided and show two cleavages at 90.°. • Cleavage: Parallel to {110}, which intersect at 90°. • Twinning: Simple and lamellar twins and composition planes, which in combination may form a herringbone pattern.

2011年1月1日 · Garnet clinopyroxenites occur as lenses within a dunite body in the Sulu ultrahigh-pressure (UHP) terrane, eastern China, and consist of variable clinopyroxene, garnet, ilmenite, and olivine with porphyroblastic or fine-grained granoblastic textures.

2023年4月23日 · Clinopyroxene is a major host for sodium, calcium, chromium, and titanium in mantle xenoliths and shows extensive solid solution toward orthopyroxene and/or garnet at high P and T in the mantle (Boyd, 1969, 1970; Brey and Köhler, 1990). The Mg# of clinopyroxene is usually slightly greater than that of coexisting olivine, due to a KD greater than 1.

2012年10月15日 · This study aims to define the origin of garnet clinopyroxenite layers from the mantle sequences of the External Ligurian ophiolites. These mantle sequences retain a subcontinental origin and were exposed at a Jurassic ocean–continent transition.

Clinopyroxene is a common phase found in basaltic andesite and andesite rocks, characterized by its high Fe-Ti content and low Cr2O3 content. It is less abundant than plagioclase phenocrysts and can be replaced by chlorite. You might find these chapters and articles relevant to this topic. D.G. Pearson, ...

2019年2月11日 · In this work, we add new chemical data on the composition of the Cerro Pelado and El Aprisco megacrysts, on minerals of clinopyroxenite and glimmerite (phlogopite-rich clinopyroxenite) enclaves, together with phenocrysts from the host alkaline magmas.

2022年1月28日 · The garnet clinopyroxenite is low in heavy rare-earth elements (HREE, 5.97–10.6 ppm) and has convex spoon-shaped chondrite-normalized REE patterns, suggesting the garnet formed later, and its precursor is clinopyroxenite.