DIOPSIDE, noun [Gr.] A rare mineral, regarded by Hauy as a variety of augite, and called by Jameson a subspecies of oblique-edged augite, occurring in prismatic crystals, of a vitreous luster, and of a pale green, or a greenish or yellowish white. The variety with four-sided prims has been called Mussite, from Mussa in Piedmont. It resembles the Sahlite.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.