Oxides of 5d elements such as Ir and Os have been attracting much attention as candidates to realize novel types of electronic ground states stabilized by the strong spin orbit coupling. This proposal is to use measure the magnetic diffraction in powders of a recently-synthesized polytype of Li2IrO3, which realizes a novel three-dimensional lattice of inter-connected Ir honeycombs, so called ¿hyperhoneycomb¿ lattice, not found in other materials before and proposed theoretically to host a so-called ¿Kitaev quantum spin liquid¿ state for strongly anisotropic interactions and cubic IrO6 octahedra, and various other unusual magnetic orders if the system is perturbed away from the ideal limit. Susceptibility measurements provide evidence for magnetic order below 40 K and here we propose to use wish to measure the magnetic diffraction and solve the magnetic structure.