In recent years, the transition metal orthotellurates, M3TeO6, with corundum-related structures, where M = Mn, Co, Ni, Cu, have been widely studied as multiferroic. Some of them have remarkable properties: Ni3TeO6, a gigantic magnetoelectric effect, and Co3TeO6, a rare inversion of ferromagnetic and ferroelectric domain patterns. The search for new orthotellurates, M3TeO6, with original crystalline structures is interesting for the research of new multiferroic compounds. Recently, we have synthesized a new polymorphic phase of Co3TeO6 as single crystals by transport method. The structure is based on different cobalt coordination polyhedra. Magnetic measurements showed an inclined ferroelectric or antiferromagnetic ground state and the presence of multiple phase transitions depending on the applied magnetic field. For this study, we need 12 days on D9 to correctly solve the complex magnetic structures expected at low temperature and to establish the magnetic phase diagram of this new polymorph under applied magnetic field using the normal beam geometry also available on D9.