nepheline monzonite

nepheline monzonite

[′nef·ə‚lēn ′män·zə‚nīt]
(petrology)
A nepheline syenite in which sodic plagioclase exceeds the quantity of alkali feldspar.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.