Origin
India, Southern and central Africa, Madagascar
-
Color
Black, Brownish, Greenish
Blue, gray, Black
Streak
Brown
Blue
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
3.18-3.223-3.15
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{1011} Indistinct
Good on [110] and on [001]
Mohs Hardness
-99996.0-6.5
2
10
👆🏻
Chemical Composition
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
[ ]Na2(Mg3Al2)Si8O22(OH)2
Luster
Vitreous
Vitreous, Pearly
Pleochroism
Very strong: yellow-brown pale yellow
Strong
Dispersion
0.020.02
0.005
1
👆🏻
Transparency
Transparent, Translucent
-
Refractive Index
1.635-1.6721.606-1.637
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
monoclinic
Birefringence
0.025-9999
0
0.296
👆🏻
Clarity
Transparent
-
Physical
Neurological
-
-
Cardiovascular
-
-
Respiratory
Good
Good
Reproductive
-
-
Digestive
-
-
Psychology
Protection
Communication
Healing
Emotional healing
Emotional healing
Qualities Associated
Protection & Grounding
Peace