[dahy-op-sahyd, -sid]
noun Mineralogy.
a monoclinic pyroxene mineral, calcium magnesium silicate, CaMg(SiO 3 ) 2 , occurring in various colors, usually in crystals.

1800–10; di-3 + Greek óps(is) appearance + -ide

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World English Dictionary
diopside (daɪˈɒpsaɪd, -sɪd)
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 & Unabridged 10th Edition
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American Heritage
Science Dictionary
diopside   (dī-ŏp'sīd')  Pronunciation Key 
A light green, monoclinic variety of pyroxene, used as a gemstone and as a refractory material. Chemical formula: CaMgSi2O6.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Diopside is generally dispersed, though locally forms cm-scale aggregates.
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