Origin
Southern and central Africa
Southern and central Africa
Color
Green
Colorless, gray, White
Specific Gravity
2.66-2.86
2.40-2.42
Fracture
ConchoidalWalter Schumann
-
Cleavage
Indiscernible
{010} Perfect, {001} Distinct
Chemical Composition
Al 2Be 3Si 6O 18Martin H.
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pleochroism
Strongly dichroicMartin H. Read
-
Transparency
-
Transparent
Refractive Index
1.59
1.584-1.615
Crystal System
-
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a
Birefringence
0.004-0.010
0.028-0.030
Respiratory
Excellent
Good
Psychology
Creativity
Imagination
Healing
-
Emotional healing
Qualities Associated
Creativity
Harmony