leuciten.
/ˈl(j)uːsʌɪt/ Mineralogy.attributive.1878 P. H. Lawrence tr. B. von Cotta Rocks Classified (new ed.) 135 Leucite rock may be regarded as a dolerite, in which the labradorite is replaced by leucite.
Silicate of aluminium and potassium, usually found in glassy trapezohedrons, occurring in volcanic rocks, esp. in lavas from Vesuvius.
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the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspathoid > leucite
leucite1799
amphigene1803
1799 Med. & Physical Jrnl. 1 300 In the decomposition of the fossil, called leucit, he [Klaproth] found from 20 to 22 parts of potass in the hundred.
1806 W. Henry Epitome Chem. (ed. 4) ii. ii. 349 The volcanic leucite contained less potash than other kinds.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) vii. 146 Many of the older lavas yield agates..leucite..and other precious minerals.
Derivatives
leuˈcitic adj. containing or of the nature of leucite.
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1830 C. Lyell Princ. Geol. I. 352 The foundations of the town [Pompeii] stand upon the old leucitic lava of Somma.
1880 G. F. Rodwell in Nature 12 Feb. 352/2 The lava is very leucitic.
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ˈleucitoid n. Crystallography the trapezohedron or tetragonal trisoctahedron; so called as being the form of the mineral leucite.
leuˈcitophyr n. (also leu'citophyre) [ < German (por)phyr porphyry; compare granophyre n.] ‘a dark-grayish fine-grained cellular volcanic rock consisting of augite and leucite together with some disseminated magnetic iron’ (Dana Man. Geol. 1868).
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1879 F. Rutley Study of Rocks x. 109 As in the little leucite crystals of the sperone or leucitophyr which occurs near Rome.
This entry has not yet been fully updated (first published 1902; most recently modified version published online December 2020).
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