Kyanite can be recognized by its beautiful bluish greenish coloring. It is found most frequently in metamorphic rocks. What is interesting about kyanite is that is has a variable hardness. Kyanite’s crystals have a hardness of between 4.5 to 5 on Mohs hardnss scale when tested parallel to the length of the crystal. When tested across the short dimension of the crystal, kyranite’s hardness is between 6.5 to 7.
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