Origin
Sri Lanka, Burma, USA, Russia
USA
Color
Yellow, Brown, pink, Colorless
Blue, Green
Streak
White
Blue, Greenish, White
Specific Gravity
3.46-3.50
5.6-5.76
Fracture
Conchoidal
Uneven
Cleavage
Perfect
[001] perfect; [100] distinct
Chemical Composition
MgAlBO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Pleochroism
Trichroism: green light brown dark brownHerve Nicolas Lazzarelli
Weak
Transparency
-
Transparent
Refractive Index
1.665-1.712
1.818-1.909
Crystal System
Orthorhombic
Orthorhombic
Birefringence
0.036-0.042
0.091
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Psychology
Intuition
Creativity
Healing
Emotional healing
-
Qualities Associated
Emotional Healing
-