Kyanite is a mineral species that is typically blue in color, but can also occur in white, gray, or green. It's a type of aluminum silicate mineral, known for its distinctive anisotropic properties, meaning its crystal structure and hardness vary depending on direction. Here are some interesting facts about kyanite: 1. Name: Kyanite comes from the Greek word "kyanos," meaning blue. 2. Hardness: Kyanite's hardness ranges from 4.5 to 7 on the Mohs scale, depending on direction. 3. Appearance: Often found in blade-like or columnar crystals. 4. Uses: Kyanite is used in ceramics, electronics, and as a gemstone. 5. Locations: Found in metamorphic rocks, particularly in the United States, Brazil, and Switzerland.