For the periodic system, we downloaded all SiO 2 bulk structures from the MaterialsProject (MP) database with < 0.02 eV/atom energy above the convex hull, amounting to 168 structures with varying unit cell size. We then randomly picked six SiO 2 bulk structures with up to 18 atoms per unit cell as target structures, and used the remaining 167 structures as training data for each target. For each target, atom coordinates for the given atoms in the unit cell were then predicted. The energies of the subsequently relaxed structures were then compared to the energies of the target structures to identify whether a structure was found by LoGAN. A full list of all SiO 2 is given in the Supporting Information.