Meionite is a rare mineral belonging to the Garnet family. Its chemical formula is Ca4Al6Si6O24CO3. Meionite is known for its stunning blue, purple, and grey colors and is often used as a gemstone. Some synonyms for meionite include the names clinohumite, clinopyroxene, diopside, hibonite, and vesuvianite. Clinohumite is a rare magnesium silicate mineral that is closely related to peridot, while clinopyroxene is a group of minerals that are often found in igneous and metamorphic rocks. Diopside is a silicate mineral commonly found in igneous and metamorphic rocks and is often used in jewelry. Hibonite and vesuvianite are both calcium aluminate minerals that are also used as gemstones.