Kyanite is a blue stone with pearly luster, triclinic and composed of aluminum silicate. It is found in metamorphic and sedimentary rocks. Kyanite is anisotropic, i.e. hardness varies depending on its crystallographic direction. Cleavage surfaces typically display a pearly luster. Kyanite is used as a semiprecious gemstone, that may display chatoyancy. Kyanite is known to promoting communication, enhance tranquility, and aid in spiritual growth. It has healing effects on the throat and respiratory issues.