orthopyroxenen.
/ˌɔːθə(ʊ)pʌɪˈrɒksiːn/, U.S. /ˈˌɔrθoʊˌpaɪˈrɑkˌsin/, /ˈˌɔrθoʊpəˈrɑkˌsin/ Mineralogy.
Any mineral of the pyroxene group which crystallizes in the orthorhombic system. Contrasted with clinopyroxene.
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orthopyroxene1903
1903 Mineral. Mag. 13 374 Following Rinne, E. Düll..proposes the terms ortho-pyroxene and klinopyroxene.
1940 Amer. Mineralogist 25 282 Orthopyroxenes of plutonic igneous rocks normally show well developed diopsidic lamellae.
1963 W. A. Deer et al. Rock-forming Minerals II. 33 Many orthopyroxenes can be distinguished from clinopyroxenes by their characteristic pink to green pleochroism.
2002 Internat. Geol. Rev. 44 336 The andesitic rocks contain clinopyroxene and plagioclase with minor olivine and orthopyroxene, but lack amphibole and biotite, suggesting crystallization from an anhydrous magma.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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