diopside

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di·op·side

 (dī-ŏp′sīd′)
n.
A light green, monoclinic pyroxene mineral, CaMgSi2O6, used as a gemstone and refractory.

[French : di-, two (from Greek; see di-1) + Greek -opsis, -opsis.]
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.

diopside

(daɪˈɒpsaɪd; -sɪd)
n
(Minerals) a colourless or pale-green pyroxene mineral consisting of calcium magnesium silicate in monoclinic crystalline form: used as a gemstone. Formula: CaMgSi2O6
[C19: from di-2 + Greek opsis sight, appearance + -ide]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

di•op•side

(daɪˈɒp saɪd, -sɪd)

n.
a varicolored monoclinic pyroxene mineral, calcium magnesium silicate, CaMg(SiO3)2, usu. occurring in crystals.
[1800–10; di-3 + Greek óps(is) appearance + -ide]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.