Origin
Australia
Canada, Southern and central Africa
Color
Blue, Green, Greenish, Black
Green, Yellow, Red
Specific Gravity
4.00-4.62
3.28-3.32
Fracture
Conchoidal, Uneven
Uneven
Cleavage
Indistinct parting on [111]
{101} Distinct
Mohs Hardness
7.5-8
6-6.5
Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references
Transparency
-
Transparent
Refractive Index
1.790-1.818
1.593-1.596
Crystal System
cubic
Tetragonal Trapezohedral H-M Symbol (4 2 2) Space Group: I 422
Birefringence
-9999
0.001
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Neurological
Enhances mental clarity and focus
Enhances mental clarity and focus
Respiratory
Aids in digestion and soothes the stomach
-
Psychology
Protection
Personal power
Healing
Emotional healing
Physical healing
Qualities Associated
Harmony
Vitality