Diopside

One of the most common members of the pyroxene group of minerals, diopside is named from the Greek word for "double" and "appearance," in allusion to two possible orientations of the prism zone. It is characteristically found as a contact metamorphic mineral in limestone and dolomites. Transparent varieties can be cut and used as gemstones.

Mineral Photos courtesy of R.Weller/Cochise College