Kyanite is a blue silicate mineral commonly found in metamorphic rocks. It is composed mainly of aluminum and silica and is known for its unique property of having different hardness levels depending on the crystal direction. This makes it useful in various industrial applications, including ceramics and refractory materials. Kyanite often forms in high-pressure environments, such as those found in mountain ranges. Its striking blue color and elongated crystals make it popular among collectors and in jewelry. Additionally, it is sometimes associated with other minerals like quartz and muscovite, enhancing its aesthetic appeal.