Origin
Southern and central Africa
Canada, Southern and central Africa
Color
Yellow
Green, Yellow, Red
Specific Gravity
1.98-2.50
3.28-3.32
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
None
{101} Distinct
Mohs Hardness
5.5-6.5
6-6.5
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references
Transparency
Translucent
Transparent
Refractive Index
1.37-1.52
1.593-1.596
Crystal System
-
Tetragonal Trapezohedral H-M Symbol (4 2 2) Space Group: I 422
Birefringence
-9999
0.001
Clarity
Translucent
Transparent
Neurological
-
Enhances mental clarity and focus
Psychology
Creativity
Personal power
Healing
Emotional healing
Physical healing
Qualities Associated
Imagination
Vitality