Gold(i) sulfide: unusual bonding and an unexpected computational challenge in a simple solid† †Electronic supplementary information (ESI) available: Analysis of the pressure-induced amorphization in Au2S and calculated band structure. See DOI: 10.1039/c9sc00371a

Cubic cuprite-type gold(i) sulfide presents unique chemical bonding, which makes it unmodelable using current DFT methods, and a computational challenge.