agpaite

agpaite

[′ag·pə‚īt]
(petrology)
A group of igneous rocks containing feldspathoids; includes naujaite, lujavrite, and kakortokite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Agpaite: A group of feldspathoid-bearing igneous rocks, first described from Ilimaussaq, Greenland, by Ussing in 1912, that includes sodalite-bearing nepheline syenite, naujaite, lujavrite, kakortokite, etc., and is distinguished by having (Na + K)>Al on a molecular or atomic basis.
Mineral associations from Burpala are typical of alkaline massifs with an intermediate position between miaskite and agpaite alkaline rocks; the associations are similar to the mineralogy of alkaline pegmatites from Langesundfjord (southern Norway) and Colorado (USA).