Senarmontite is a rare mineral that is commonly used in making fireworks. It is a type of antimony oxide that is colorless and crystalline in nature. The mineral is often referred to as antimonous oxide, antimony trioxide, or antimonic oxide. Other synonyms for senarmontite include antimony(III) oxide, antimonous anhydride, and Caswell No. 031. These synonyms are often used interchangeably with senarmontite when discussing the properties and uses of the mineral. Although senarmontite is rare, it is an important mineral that has various industrial applications, including in the manufacturing of glass, ceramics, and semiconductor devices.