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Any of several varieties of the mineral pyroxene, such as diopside and augite, that have monoclinic crystals.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Minerals) a member of the pyroxene group of minerals having a monoclinic crystal structure, such as augite, diopside, or jadeite
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014