pyroxenoidn.adj.
/pʌɪˈrɒksənɔɪd/, U.S. /paɪˈrɑksəˌnɔɪd/, /pəˈrɑksəˌnɔɪd/ Mineralogy.
Any of a small group of triclinic silicates formerly classed as pyroxenes but now differentiated from them on structural grounds, including rhodonite, wollastonite, and pectolite. Also attributive or as adj.
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pyroxenoid1937
1937 H. Berman in Amer. Mineralogist 22 389 The so-called ‘triclinic pyroxenes’ are not included here in the pyroxenes because the writer believes they are more properly considered as a separate group, with no isomorphous relations to any of the pyroxene minerals, and with physical and chemical properties clearly differing from those of the pyroxenes. To these pyroxene-like minerals we here give the name pyroxenoids.
1966 J. Sinkankas Mineral. ii. 487 The pyroxenoids are species whose chemical compositions resemble the pyroxenes, but [whose] crystal structures differ slightly but importantly in the way the chains are linked and arranged.
1988 Amer. Mineralogist 73 798/2 A pyroxenoid of MnSiO3 composition undergoes successive polymorphic transformations from rhodonite to pyroxmangite to clinopyroxene.
1997 G. Ottonella Princ. Geochem. v. 280 Below the melting point the orthorhombic phase has another transition to a pyroxenoid phase.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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