noriten.
/ˈnɔːrʌɪt/, U.S. /ˈnɔˌraɪt/ Geology.
A coarse-grained plutonic rock similar to gabbro but with orthopyroxene (usually hypersthene) dominant over clinopyroxene.
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the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > plutonic rocks > greenstone > varieties of
mulatto1816
hornblende rock1821
diorite1826
hypersthene rock1838
hypersthenite1849
norite1853
aphanite1863
hyperite1863
1853 J. D. Forbes Norway & its Glaciers vii. 144 Called by Esmark the norit formation, evidently subordinate to the gneiss, but in which the feldspar is pure white.
1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 143 The norite of Scheerer is a compound of hypersthene or diallage, labradorite, orthoclase (containing soda), and even some quartz.
1885 A. Geikie Text-bk. Geol. (ed. 2) 154 Norite. Under this name Rosenbusch has proposed to group all the older gabbro-like rocks in which any rhombic pyroxene..is conjoined with a plagioclase felspar.
1920 Geol. Mag. 57 214 Certain inclined bands in the norite have been thoroughly laterized for many yards along their outcrop.
1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) v. 85 Gabbros with olivine are abundant, giving olivine gabbro (and olivine norite).
1971 New Yorker 17 Apr. 122/2 Dr. John A. Wood..came upon some particles of norite in the dust from the mare lowlands brought back by the Apollo 12 crew.
1989 Jrnl. Petrol. 30 157 The OB I tractolites are enriched in carbon compared to associated norites and anorthosites.
This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1853