Tourmaline is a common mineral. It can range from odorless to red, blue, brown, violet, green, orange, and yellow. This gem has a vitreous luster, meaning glass as appearance. It also has a trigonal crystal system. On the Mohs Hardness Scale, it is on the 7-7.5 scale, near defining mineral (10). Since this is a Tourmaline, its pleochroism is moderate to strong. Click here for all Tourmaline pleochroisms.
(Al, Fe, Li, Mg, Mn)3(Al, Cr, Fe, V)6(BO3)3(Si, Al, B)6O18(OH, F)6
Hardness (Mohs Hardness Scale)
3.06 (+0.2, -0.06)
Moderate to Strong