👉 The term "hausmannite" is a name given to a type of mineral, which is not related to any known geological formation or mineral. It is often used in the context of rare earth minerals, particularly lanthanum and cerium. The material is composed of lanthanum oxide (LaO2) with cerium oxide (CeO2). The term "hausmannite" was first proposed by the German chemist Hans Hausmann in 1957
