Blue Kyanite is the most prized variety of stone. The deep blue color is especially valuable. Blue Kyanite is commonly used as an imitation of blue sapphire. However, it is less hard than corundum, i.e., 5 or 7 on the Mohs scale.
Occurrence
Blue Kyanite occurs in India and Myanmar (Burma).
Blue Kyanite Properties
- Specific Gravity: 3.68
- Refractive Index: 1.71-1.73
- Birefringence (DR): 0.017
- Luster: Vitreous to pearly
- Crystal Structure: Triclinic
- Composition: Aluminum silicate
- Hardness: 5 or 7
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