Though tourmaline occurs in almost every color, blue tourmalines, also known as indicolites, are a rarity. Coloured by iron, indicolites can vary from light to deep blue and are on the higher end of the price scale due to their exclusivity.
Mohs Scale Hardness
7.0 - 7.5
Specific Gravity
3.02 - 3.26
Birefringence
0.014 - 0.021
Refractive Index
1.62 - 1.64
