Madocite is a rare mineral that is often found in volcanic rocks and it has limited synonym usage owing to its unique properties. However, some synonyms that are sometimes used to describe madocite are Ulexite, anhydrite, calcite, and celestine. Ulexite is a borate mineral that is known for its fibrous crystal habit and has remarkable optical properties. Anhydrite, on the other hand, is a mineral that is composed of calcium sulfate and has similar physical properties to madocite. Calcite and celestine are minerals that belong to the same class as madocite and can sometimes be used interchangeably. Although these synonyms do not exactly capture the uniqueness of madocite, they can be useful for comparison and identification purposes in the field of geology.