Physical Properties of Kyanite Kyanite is a well-known and beautiful silicate mineral that mainly occurs in shades of blue. It is found in masses, but more commonly as long bladed crystals, or somewhat fibrous looking blades or shards. Blue is the main color by far (most valuable are the dark blue ones that can fall into gemstone grade category), but kyanite can also be found in the colors of black, white, green, pink, and yellow. The Mohs hardness ranges from around 5-7 depending on where you measure it. If vertical, it is 4.5 to 5.5 on the Mohs scale, while
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