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We have investigated the crystal and magnetic structures of the trigonaliron-boracite Fe3B7O13X with X = OH by neutron diffraction. Neutron diffractionenables us to locate the hydrogen atom of the hydroxyl group and determine themagnetic ground state of this member of the multiferroic boracite family. Noevidence was found for a monoclinic distortion in the magnetic ordered state.The magnetic symmetry allows for magnetoelectric and ferroelectric properties.The N/'eel tempera- ture TN of 4.86(4) K confirms the general trends within theboracites that TN decreases from X = I > Br > Cl > OH. Surprisingly whileFe3B7O13OH exhibits the largest frustration with $|\theta/T_N| = 5.6$ withinthe Fe3B7O13X series, no reduction of the magnetic moment is found usingneutron diffraction.

Investigation of the crystal and magnetic structures of the trigonal multiferroic iron-boracite Fe3B7O13(OH)