Chrome-diopside is a common mineral in ultramafic rocks and kimberlites, whereasureyite has up to now only been found in some iron meteorites in Mexico and Burmesejade. The mineral species belonging to diopside-ureyite series in composition has been re-ported in kimberlite, Yakutia. Recently, a chromium-rich sodium calcium Chrome-diopside is a common mineral in ultramafic rocks and kimberlites, whereasureyite has up to now only been found in some iron meteorites in Mexico and Burmesejade. The mineral species belonging to diopside-ureyite series in composition has been re-ported in kimberlite, Yakutia Recently, a chromium-rich sodium calcium