Summary: A new mineral with the approximate composition of Fe₂MgTi₃O₁₀ and isostructural with pseudobrookite Fe₄Ti₂O₁₀ has been observed in an olivine-augite-alkali-feldspar rock of the Karroo succession from the Mateke Hills area in south-eastern Southern Rhodesia. Chemical analysis and indexed X-ray powder data (α 9·77, b 9·95, c 3·73 Å.) of the mineral are given, and the name kennedyite is proposed. The name karrooite is proposed for the artificial product MgTi₂O₅.