gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1991.055.381.07 Mineralogy On the Poikilitic Nature of Jabal Al Hasawinah Eudialyte Oun Khaled M. University of Al Fatah, Department of Geology, P.O. Box 13258, Tripoli, Libya 12 1991 55 381 543 547 17 9 1990 26 11 1990 Copyright © 1991, The Mineralogical Society 1991 Abstract

Poikilitic eudialyte outcrops in a strongly peralkaline phonolithic cumulo-dome in Jabal Al Hasawinah, Libya. Textural relationships reveal that the eudialyte has formed at a very late stage of the rock petrogenesis. Electron microprobe analyses confirm its volatile (hydrous) nature and low REE content.

 Keywords eudialyte phonolite Jabal Al Hasawinah Libya