Cyanite, also spelled kyanite, is a mineral that is typically blue, but can also be found in green, black, and other colors. It is composed of aluminum silicate and is known for its unique and variable hardness, which can differ in different directions (a property called anisotropy). Cyanite is commonly used in the manufacturing of ceramics, as well as in the production of refractory materials due to its high melting point. It is often found in metamorphic rocks, particularly those that have undergone intense pressure and heat.
