Herein we report on the oxidation of bulk Ti2GeC in air in the 600 degrees C to 800 degrees C temperature range. At 600 degrees C, and up to 500 h, the oxidation kinetics are sub-parabolic and the rutile TiO2 layer formed is adherent and protective. At 700 degrees C and 800 degrees C the kinetics are parabolic up to 100 h before becoming linear. X-ray diffraction confirmed the presence of two rutile structures, TiO2 and GeO2, and a hexagonal GeO2 on the oxidized surfaces. The oxidation occurs by inward diffusion of oxygen through a rutile (Ti1-xGex)O-2 solid solution with x <= 0.07. Additionally, and throughout the entire temperature range studied, an oxygen-induced decomposition - occurring predominantly at the oxide/carbide interface - results in the formation of an elemental Ge-rich phase. If the rutile layer is not protective, the latter oxidizes into hexagonal GeO2. (c) 2013 Elsevier B.V. All rights reserved.