a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene
Examples of 'orthopyroxene' in a sentence
orthopyroxene
The mineral constituents of local granulite are plagioclase, amphibole, biotite, clinopyroxene, garnet, and orthopyroxene.
Carmine Apollaro 2019, 'Geochemical Modeling of Water-Rock Interaction in the Granulite Rocks of Lower Crustin the Serre Massif (Southern Calabria, Italy)', Geofluidshttp://dx.doi.org/10.1155/2019/5602648. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Diffusive equilibration in orthopyroxene was evaluated by comparing zonations in elements with different known diffusivities.
Maurice Brodbeck, Teresa Ubide, Ilka C. Kleinhanns, Ronny Schoenberg, Balz S. Kamber 2019, 'Quantitative Data Extraction from Orthopyroxene Trace Element Maps and Its Potentialto Examine the Formation of the UG2 Unit, Bushveld Complex', Mineralshttps://www.mdpi.com/2075-163X/9/2/73. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
They are composed of orthopyroxene and clinopyroxene phenocrysts with serpentine, talc, and amphibole (altered clinopyroxene).
Tarun C. Khanna, V. V. Sesha Sai, S. H. Jaffri, A. Keshav Krishna, M. M. Korakoppa 2018, 'Boninites in the ~3.3 Ga Holenarsipur Greenstone Belt, Western Dharwar Craton, India',Geoscienceshttp://www.mdpi.com/2076-3263/8/7/248. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
In one locality, zoned chromites are hosted in orthopyroxene-amphibole peridotites.
Juan Miguel Guotana, Tomoaki Morishita, Ryoko Yamaguchi, Ikuya Nishio, Akihiro Tamura,Kenichiro Tani, Yumiko Harigane, Kristoffer Szilas, D. Graham Pearson 2018, 'Contrasting Textural and Chemical Signatures of Chromitites in the Mesoarchaean UlamertoqPeridotite Body, Southern West Greenland', Geoscienceshttp://www.mdpi.com/2076-3263/8/9/328. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Hydration reactions include the breakdown of cordierite and orthopyroxene to gedrite + kyanite, and anthophyllite, respectively.
Jan Marten Huizenga, Dirk van Reenen, Jacques L.R. Touret 2014, 'Fluid-rock interaction in retrograde granulites of the Southern Marginal Zone, Limpopohigh grade terrain, South Africa', Geoscience Frontiershttp://www.sciencedirect.com/science/article/pii/S1674987114000218. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Chemical analyses are given of the phlogopite, kornerupine, orthopyroxene and cordierite occurring in the rock.
O. v. Knorring, Th.G. Sahama, M. Lehtinen 1969, 'Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar', Bulletin of the Geological Society of Finlandhttp://www.geologinenseura.fi/bulletin/Volume41/sgs_bt_041_pages_079_084.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
On the other hand, rare, olivine-rich dunites with scarce orthopyroxene porphyroclasts are associated with harzburgites.
Koppa Matúš, Koller Friedrich, Putiš Marián 2014, 'Petrology and geochemistry of a peridotite body in Central- Carpathian Paleogene sediments(Sedlice, eastern Slovakia)', Geologica Carpathicahttp://www.degruyter.com/view/j/geoca.2014.65.issue-5/geoca-2014-0022/geoca-2014-0022.xml?format=INT. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Silicate minerals in the inclusions are olivine, plagioclase, phlogopite, hornblende, clino- and orthopyroxene.
Sobhi Nasir 2009, 'Multiphase Mineral Inclusions in Ferrikaersutite Megacrysts : Implications for PostmagmaticAlteration of the Kaersutite Host', Sultan Qaboos University Journal for Sciencehttps://journals.squ.edu.om/index.php/squjs/article/view/357. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)