Origin
Kazakhstan
Southern and central Africa
Color
White, Colorless
Blue
Specific Gravity
1.847-1.852
3.25
Cleavage
Poor to indistinct on {010}
Imperfect in one direction
Chemical Composition
Ca3Al3(SiO4)3(OH)
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Transparency
-
Transparent
Refractive Index
1.488-1.525
1.607-1.672
Crystal System
Triclinic
monoclinic
Birefringence
0.027-0.034
0.065
Psychology
-
Communication
Healing
-
Emotional healing
Qualities Associated
-
Communication