Calcium-rich pyroxenes and olivine, along with nickel-iron metal, have been detected on Eunomia's surface.
A type locality is the Gullewa Greenstone Belt, in the Murchison region of Western Australia, and the Duketon Belt near Laverton, where pyroxene spinifex lavas are closely associated with gold deposits.
It was named after the Australian earth scientist Ted Ringwood (1930–1993) who studied polymorphic phase transitions in the common mantle minerals, olivine and pyroxene, at pressures equivalent to depths as great as about 600 km.