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The indides RE 12 Fe 2 In 3 (RE ϭ Ho, Er, Tm, Lu) have been prepared by arc-melting the elements and subsequent annealing. All compounds were characterized by X-ray powder diffraction and the Er 12 Fe 2 In 3 structure was refined from X-ray single crystal data: I4/mmm, a ϭ 958.8(1), c ϭ 957.8(1) pm, wR2 ϭ 0.0629, 412 F 2 values and 22 variables. The 2a site shows In/Fe mixing, leading to the composition Er 12 Fe 2.31 In 2.69 for the investigated crystal. The structure (new type) derives from a Cu