| 释义 |
urtite, n. Petrogr.|ˈɜːtaɪt|
[ad. G. Urtit (W. Ramsay 1896, in Geologiska Föreningens i Stockholm Förhandl. XVIII. 459), f. the name of Lujavr-Urt (now Lovozero), a lake in the Kola Peninsula, Russia: see -ite.]
A light-coloured crystalline rock of the ijolite series, composed predominantly of nepheline and containing some sodic pyroxene.
1909in Cent. Dict. Suppl. 1921Trans. Geol. Soc. S. Afr. XXIV. 129, I judge the urtite bodies to be merely segregation veins within ijolite and foyaite. 1955Brown & Dey India's Mineral Wealth (ed. 3) 640 Greenish yellow elæolite from an urtite near Sinkwa, in the Mogok Stone Tract. |