Force field of Mn3O4

GROMACS version:
GROMACS modification: Yes/No
Dear GROMACS Users
I want to simulate Mn3O4 crystal slab in GROMACS. Can anyone suggest suitable force field parameters for Mn and O? Mn3O4 has both ionic and covalent bonds between Mn and O and two oxidation states of Mn(+2 and +3).

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