Origin
Southern and central Africa
Southern and central Africa
Color
White, Colorless, Blue, Red, Green, Yellow, Violet
Brown, Black, Blue
Specific Gravity
3.95-4.10
2.65
Fracture
Uneven
ConchoidalWalter Schumann
Mohs Hardness
-9999
-9999
Chemical Composition
Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2Ulrich Henn and Claudio C.
Pleochroism
-
Definite: brown reddish-brownWalter Schumann
Transparency
Transparent, Translucent
Transparent, Translucent
Refractive Index
1.757-1.780
1.544-1.553
Birefringence
0.007-0.010
0.009
Clarity
Transparent
Transparent
Neurological
-
Improves digestion and metabolism
Psychology
Passion
Protection
Healing
Emotional healing
Emotional healing
Qualities Associated
Passion
Protection