essexiten.
/ˈɛsɪksʌɪt/ Geology.
Any crystalline igneous rock consisting of labradorite or similar plagioclase, alkali feldspar, and nepheline, together with various mafic minerals.
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the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > other igneous
clay-stone1777
variolite1781
pyroxenite1845
aplite1862
anorthosite1863
teschenite1866
yellow ground1883
kimberlite1887
sanidinite1887
websterite1890
essexite1891
monzonite1895
missourite1896
theralite1898
heronite1899
kentallenite1900
carbonatite1924
wonderstone1936
1891 J. H. Sears in Bull. Essex (Mass.) Inst. 23 146 I would, therefore, propose the name of Essexite for this ancient elæolite-zircon-syenite rock.
1963 W. A. Deer et al. Rock-forming Minerals II. 109 Titanaugites are the typical pyroxenes of basic alkaline rocks, e.g. teschenite, essexite and nepheline dolerite.
1989 Encycl. Brit. IV. 567/1 As the proportion of nepheline increases, essexite grades into theralite.
Derivatives
esseˈxitic adj. of or pertaining to essexite.
ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > other igneous
aplitic1877
alkalic1902
monzonitic1909
essexitic1927
1927 Trans. Royal Soc. Edinb. 55 504 We regard the mugearitic and essexitic intrusions of the Dalmahoy syncline as hypabyssal expressions of the magma which gave rise to the accompanying effusive mugearites and allied basalts.
1947 Proc. Indian Acad. Sci. A. 25 75 It is deduced from these studies that the original magma is probably an ultrabasic (essexitic or picritic) type.
1974 Geol. Mag. 111 343 The sill is of essexitic composition.
This entry has not yet been fully updated (first published 1993; most recently modified version published online June 2020).
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n.1891