Home / Explore / Minerals / Deltalumite Minerals Deltalumite deltalumite (Al0.67☐0.33)Al2O4 Deltalumite (δ-alumina, Al$_{2}$O$_{3}$) Structure: A3B4_tP84_115 ... — via aflow.org · Source Overview Deltalumite is a mineral species (aluminium oxide mineral). It crystallises in the tetragonal system. Scientific references Deltalumite — Wikidata. https://www.wikidata.org/wiki/Q27013457 Link