H1 Mn-Al-C GGen exploration candidate (action 01a06e15-0cb2-702f-bc28-fec045530a28, e_above_hull 51 meV/atom). Validated 2026-09-04: parsed, reduced formula Mn14Al2C, 17 sites, SG P4mm (99) (symprec 0.01 and 0.1), density 7.07 g/cm3, min pair distance 1.912 A, ordered.