Fe10Si6 Cmcm, best of 200 random trials (ORB -7.7266 eV/atom)

Lowest-energy Fe10Si6 cell from 200 random PyXtal + ORB trials. 40 meV/atom below the ORB energy of the Materials Project Fe5Si3 P6_3/mcm phase, but 6 meV/atom above the ORB Fe3Si–FeSi tie line: a near-hull ordered bcc-derived arrangement, not a new stable phase. Cmcm at symprec 0.1; written as P1.