C14 MgZn2-type CIF for MnFeSi inverted ordering (Fe at 2a(0,0,0), Mn at 2a(0,0,1/2)) — SG 194 P6₃/mmc, placeholder lattice a=5.00Å, c=8.10Å. Energy comparison vs MnFeSi_layered reveals Mn/Fe site preference.