kyanite

Kyanite is a silicate mineral composed primarily of aluminum silicate (Al₂SiO₅). It is known for its unique properties and beautiful colors, which can range from deep blue to white, green, gray, and even colorless. Here are some key facts about kyanite:

Key Characteristics:

  1. Crystal Structure: Kyanite forms in a triclinic crystal system, and its crystals are typically elongated and blade-like.
  2. Color: Most commonly blue, but can also be found in shades of green, gray, or even colorless.
  3. Hardness: Kyanite has an anisotropic hardness, meaning its hardness varies depending on the crystallographic direction. It is softer along its length (about 4.5) but harder across its width (about 7 to 7.5) on the Mohs scale.
  4. Occurrence: It is usually found in metamorphic rocks, particularly in regions with high pressure and moderate temperature. Kyanite is often associated with other metamorphic minerals like garnet, staurolite, and mica.
kyanite