Summary: A rock from the Mt. Painter area, South Australia, consists essenially of corundophilite (anal., X-ray) and corundum, with accessory boehmite, sapphirine, cordierite, muscovite, and rutile. The rock probably crystallized at 500 to 700°C under 20 000 Ib/in.² pressure, boehmite being formed by retrogressive metamorphism at 120 to 280° C.