pyroxene syenite

pyroxene syenite

[pə′räk‚sēn ′sī·ə‚nīt]
(geology)
A quartz-poor (less than 20%) member of the charnockite series, containing more microperthite than plagioclase.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.