Color
Blue
Yellow, Red, Green, Colorless, orange
Streak
-
Yellow, yellowish orange
Specific Gravity
2.60-2.90
5.50-5.90
Fracture
Conchoidal
Conchoidal
Cleavage
Indistinct
On {10 1 0}, perfect; parting on {000 1 }
Chemical Composition
Be 3Al 2Si 6O 18Ulrich Henn and Claudio C.
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Luster
-
Subadamantine, Resinous
Pleochroism
Strong dichroism: blue to colourless\
Very weak
Transparency
Transparent
TransparentRobert C. Kammerling
Refractive Index
1.560-1.604
2.013-2.029
Crystal System
-
Hexagonal
Birefringence
0.003-0.010
0.016
Clarity
Transparent
TransparentRobert C. Kammerling
Neurological
Enhances mental clarity and focus
-
Psychology
Communication
Passion
Healing
Emotional healing
-
Qualities Associated
Communication
-