Origin
Brazil
India, Southern and central Africa, Madagascar
Color
Blue, Greenish
Black, Brownish, Greenish
Streak
White
Brown
For which Rashi?
-
-
Planet
-
-
Element of Planets
-
-
Energy
-
-
How to Wear?
Finger
-
-
Ring Metal
-
-
Deities
-
-
Not to wear with
-
-
Powers
-
-
Birthstone
Planetary
-
-
Talisman
-
-
Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.313.18-3.22
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{110} Good
{1011} Indistinct
Mohs Hardness
5.5-6-9999
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg)Al 2(PO 4) 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Luster
-
Vitreous
Pleochroism
Colorless blueAnthony et al
Very strong: yellow-brown pale yellow
Dispersion
0.020.02
0.005
1
👆🏻
Transparency
-
Transparent, Translucent
Refractive Index
1.639-1.6801.635-1.672
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
-
Birefringence
0.0410.025
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
Physical
Neurological
-
-
Cardiovascular
-
-
Respiratory
Good
Good
Reproductive
-
-
Digestive
-
-
Psychology
Communication
Protection
Healing
Emotional healing
Emotional healing
Qualities Associated
Intuition & Communication
Protection & Grounding