peraluminousadj.
/ˌpəːrəˈl(j)uːmᵻnəs/, U.S. /ˌpərəˈlumənəs/ Geology.
Of an igneous rock: containing a higher proportion of alumina than of soda and potash combined. Cf. peralkaline adj.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adjective] > containing specific mineral
siliceous1656
auriferous1744
siliciferous1794
silicited1794
talcose1794
aluminiferous1804
silicated1806
venigenous1817
stanniferous1823
alumiferous1826
quartziferous1831
quartzofeldspathic1839
stannified1855
tinnified1855
acidic1876
lime-silicate1888
peralkalic1902
potassic1902
sodic1902
sodipotassic1902
felsic1912
peralkaline1913
peraluminous1927
1927 S. J. Shand Eruptive Rocks vii. 128 The following groups of rocks stand out as chemically distinct:—(a) A peraluminous group, characterised by primary muscovite, biotite, corundum, tourmaline, topaz, almandine, or spessartite. [etc.]
1964 Mineral. Abstr. 16 488/2 A peraluminous granite stock and related pegmatites..have been emplaced in pelitic and quartzo~feldspathic schists.
1993 Jrnl. Petrol. 34 653 The South Mountain Batholith is a peraluminous granitic complex ranging in composition from biotite granodiorite to muscovite-topaz ‘leucogranite’.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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adj.1927