To determine whether the analysis of the local interactions is enough to produce the crystalline phase behaviour seen experimentally for B11, we ran hard-particle Monte Carlo (HPMC) simulations to examine the effect of these local interactions on the phase behaviour of the material. The Monte Carlo simulations were performed using HPMC, 28 a plugin to the HOOMD-blue simulation toolkit. These simulations considered the particles as hard truncated tetrahedra. The truncation of the tetrahedron is given by a truncation parameter t as defined in reference 30, where the truncated tetrahedron has four equilateral triangles with edge length σ(t/2) and four hexagons with two alternating edge lengths of σ(t/2) and σ(1 -t). For our simulations we set σ = 1 for simplicity and we set the truncation parameter by calculating the ratio of the lengths of the different vertices in B11, resulting in t = 0.5 (Fig. ). This shape is also known as a space-filling truncated tetrahedron. 30 The HPMC simulations perform moves that rotate or translate the truncated tetrahedra.