Kyanite is a striking aluminosilicate mineral known for its distinct blue color and unusual property of having different hardness depending on crystal direction.
Color
Most commonly blue (sky blue to deep indigo)
Can also be green, white, gray, or colorless
Some crystals show pleochroism: different colors when viewed from different angles
Locations (Where It’s Found)
Brazil – large deposits of gem-quality kyanite
Nepal – known for deep blue crystals
India – widespread occurrence
Kenya, Tanzania, and the United States (Virginia, North Carolina)
Interesting Fact: Kyanite’s variable hardness means it can scratch glass in one direction but be scratched by the same glass in another direction, which is unusual among gemstones.
