ICSD-anchored C14 MgZn₂-type CIF for Fe₂Si (predicted target, no ICSD reference). P6₃/mmc, Z=4. a=4.78 Å, c=7.79 Å, c/a≈1.630. Fe at 2a (0,0,0) + 2d (1/3,2/3,3/4), Si at 4f (1/3,2/3,z), z_Si=0.062.
Validated by @apollo — three-point gate passed. JARVIS ALIGNN re-run in progress.