Scandium oxide, produced through a general process involving rare earth element containing ore, is primarily utilized in high-tech applications such as solid oxide fuel cells, electronics, and aerospace components. This specific production data set refers to scandium oxide intended for these high-technology sectors, where material purity and consistency are paramount. When using this data set for Lifecycle Assessment (LCA) of scandium oxide, it is crucial to apply the mass-based allocation principle as per the methodological advice provided. This entails giving appropriate consideration to scandium oxide as the main product and adequately allocating environmental impacts among the by-products, which include Fe concentrate, REs concentrate, S concentrate, Fluorite coarse ore, and Nb concentrate. Ensure that all inputs and outputs are accounted for over the entire production process, from cradle to gate, for the production of 1 kg of scandium oxide. Always refer to the Supporting Information for detailed allocation processes.