A rare mineral form of aluminum oxide, specifically an orthorhombic polymorph of Al₂O₃, named after Berlin.
From Berlin (the city) plus the mineral suffix -ite, following the tradition of naming minerals after geographic locations where they are found or studied.
Berlinite represents one of several crystal forms aluminum oxide can take—different arrangements of atoms create completely different minerals, showing how the same element can be precious diamond or humble sand.
Complete word intelligence in one call. Free tier — 50 lookups/day.