| 释义 |
ˈnephelinite Min.
[f. prec. + -ite.]
(See quots.) Hence nepheliˈnitic a., containing or characteristic of nephelinite.
1863Dana Man. Geol. 89 Nephelinite,..a crystalline granular volcanic rock consisting of nepheline and augite with some magnetic iron. 1888Teall Brit. Petrog. 360 Nephelinite..is applied to rocks in which nepheline takes the place of felspar. 1909J. P. Iddings Igneous Rocks I. ii. ii. 386 Rocks rich in feldspar have a trachytic texture; those rich in nephelite have a nephelinitic texture. 1944C. Palache et al. Dana's Syst. Min. (ed. 7) I. 733 Pegmatites of the contact zone of the nephelinitic intrusive of the Chibina tundra, Kola. 1974Nature 8 Feb. 354/1 An older series of basaltic-trachytic shield volcanoes, together with smaller nephelinitic centres. |