Kraft and Flinn＇s [2] powder X-ray diffraction data obtained from excess-phase particles in Fe + 18.5 wt % Ni + 20 wt % Cr + B alloys have been analyzed. The major boride phase was determined to be (Cr,Fe)(2)B (orthorhombic, Fddd, isomorphous with Cr2B). Its lattice parameters, a = 1.4585 +/- 0.0010 nm, b = 0.7331 +/- 0.0005 nm, c = 0.4223 +/- 0.0003 nm, are indicative of the composition (Cr1.04+/-0.08Fe0.96+/-0.08 )B It was not possible to identify the phase(s) giving rise to a much weaker set of diffraction lines in the patterns. Of the two alloys used by Kraft and Flinn as standards, the one intended to be Cr2B was found to be a mixture of Cr2B and Cr5B3 The second, intended to be Cr1.0Fe1.0B was determined to be Cr0.67+/-0.07Fe1.33+/-0.07B.