As such, they are densely clustered within the scaled density space. The 3C structure differs from the nH polymorphs and is correctly found to be slightly more structurally novel. It's important to note, however, that neighboring points in the density space are not guaranteed to be neighbors in chemical or structural space, only that they have similar densities. In this case, the SiC polymorphs are neighbors in both spaces, and despite having close neighbors, their density isn't the lowest within the set. To understand this, we can consider the cumulative distributions of SiC polymorphs against a higher density material such as As A similar situation is found with the SiO 2 polymorphs, which are chemically identical but show structural variation and high novelty relative to other points in the dataset. Pulling the LoStOP distance matrix for these materials, shown in Figure , the polymorphs are structurally dissimilar, which is in line with expectations. Excluding self similarity, the average pairwise structural distance is ∼0.92, which is 40% of the average of all pairwise distances in the control dataset, ∼2.39. Looking at the cumulative distribution of structural distances in Figure shows similar but distinct cumulative densities that are generally distant. From this information, one can infer that the SiO 2 materials sit in a distant, low density region within the space. In the interest of brevity, an exhaustive analysis of all groupings within the dataset will not be undertaken. However, a few interesting cases are worth noting. Te is structurally unique, but shows moderate density in chemical space despite being the only instance of Te in the dataset. This is odd relative to Fe which is in much lower density regions in chemical space despite there being other compounds containing Fe within the dataset. This is a consequence of the ElMD formulation which relies on the modified pettifor scale within which Te and O are near one another, with Si being relatively close. This results in Te being relatively close to the SiO 2 material cluster and many of the oxide containing compounds; hence why its chemical density is not as low as might be expected in this space. Fe and Mn are far from oxygen and are similar to one another chemically and so are in a globally more sparse region of chemical space.