This dataset is compiled from a 2016 paper by R. Tran et al, including the folks at the Materials Project, in which they calculated using DFT and slab models the surface energies of multiple crystal facets of about 70 elemental crystals and their polymorphs. This data is important for the design of nanomaterials for which surfaces dominate their properties and behavior. The data has been validated against previous computation and experiment where available, and well-known reconstruction schemes are accounted for. The results from these calculations were published in an open-source database from which this dataset was constructed. Reference: Tran R, Xu Z, Radhakrishnan B, Winston D, Sun W, Persson KA, Ong SP (2016) Surface energies of elemental crystals. Scientific Data 3: 160080. http://dx.doi.org/10.1038/sdata.2016.80