Kalsilite is a mineral that belongs to the group of feldspathoids, and has the chemical formula of KAlSiO4. Although it is a relatively rare mineral, it has several synonyms that are used to refer to it. Some of the common synonyms for kalsilite include potassic feldspathoid, potassium aluminum silicate, and kaliumaluminiumsilikat. Other less widely used synonyms for the mineral are kalsilit, kalsiliet, and ortholite. These synonyms allow for greater clarity in scientific communication and help avoid confusion between different minerals. Despite its rarity, kalsilite is an interesting mineral due to its distinct crystal structure and unique chemical composition.