This construction is layered: the B12 icosahedra and bridging carbons kind a network plane that spreads parallel towards the c-plane and stacks together the c-axis. The lattice has two basic composition models �?the B12 icosahedron and the B6 octahedron. Due to smaller dimensions with the B6 octahedra, they cannot interconnect. https://cnc-punching-machine81479.aioblogs.com/85110447/everything-about-spherical-aluminum-oxide-al2o3-powder