Origin
Southern and central Africa
USA, Switzerland, Tanzania, Madagascar, Russia, Sri Lanka
Color
Colorless, White, gray, Brown, pink
Colorless, Yellow, pink, Red
Specific Gravity
3.05-3.08
2.90-2.98
Fracture
Uneven, Irregular, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Distinct on {11 2 0}, imperfect on {10 1 1}
Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pleochroism
-
Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli
Transparency
Semitransparent
-
Refractive Index
-9999
1.650-1.695
Crystal System
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I a3d
Trigonal
Birefringence
-9999
0.016
Clarity
TranslucentAnthony et al
TransparentUlrich Henn and Claudio C. Milisenda
Cardiovascular
Supports heart health
Supports heart health
Respiratory
Good
Excellent
Psychology
Empathy
Clarity
Healing
Emotional healing
Emotional healing
Qualities Associated
Emotional Healing
Spiritual Activation