diopside
noun
di·op·side dī-ˈäp-ˌsīd 
: a green to white mineral that consists of pyroxene containing little or no aluminum
diopsidic
ˌdī-ˌäp-ˈsi-dik
adjective 
Example Sentences
Recent Examples on the Web Other magnesium-bearing minerals include carnallite, cordierite, and diopside. 
David Bressan, Forbes, 4 July 2021 This one—with its boulder opal center surrounded by diamonds and four diopsides—is particularly stunning. Lane Florsheim, WSJ, 3 Dec. 2018
David Bressan, Forbes, 4 July 2021 This one—with its boulder opal center surrounded by diamonds and four diopsides—is particularly stunning. Lane Florsheim, WSJ, 3 Dec. 2018 Word History
Etymology
French, from di- + Greek opsis appearance — more at optic
First Known Use
circa 1808, in the meaning defined above