Origin
Brazil
Southern and central Africa
Color
Blue, Green, Colorless, White
Yellow
Specific Gravity
2.81
1.98-2.50
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
{001} Perfect
None
Mohs Hardness
4.5-5
5.5-6.5
Chemical Composition
NaAl 3(PO 4) 2(OH) 4 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Transparency
Transparent
Translucent
Refractive Index
1.590-1.599
1.37-1.52
Birefringence
0.009
-9999
Clarity
Transparent
Translucent
Psychology
Calmness
Creativity
Healing
Emotional healing
Emotional healing
Qualities Associated
Balance
Imagination