Origin
India, Southern and central Africa, Madagascar
Mexico
Color
Black, Brownish, Greenish
Black, Red
Streak
Brown
Red
For which Rashi?
-
-
Planet
-
-
Element of Planets
-
-
Energy
-
-
How to Wear?
Finger
-
-
Ring Metal
-
-
Deities
-
-
Not to wear with
-
-
Powers
-
-
Birthstone
Planetary
-
-
Talisman
-
-
Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.18-3.225.85
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
{1011} Indistinct
Distinct on {10 1 1}, imperfect on {01 1 2}
Mohs Hardness
-99992.5-3
2
10
👆🏻
Chemical Composition
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Ag 3SbS 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Luster
Vitreous
Adamantine
Pleochroism
Very strong: yellow-brown pale yellow
Distinct
Dispersion
0.020.05
0.005
1
👆🏻
Transparency
Transparent, Translucent
Translucent
Refractive Index
1.635-1.6722.881-3.084
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
Trigonal
Birefringence
0.0250.203
0
0.296
👆🏻
Clarity
Transparent
Translucent
Physical
Neurological
-
-
Cardiovascular
-
-
Respiratory
Good
-
Reproductive
-
-
Digestive
-
-
Psychology
Protection
-
Healing
Emotional healing
Emotional healing
Qualities Associated
Protection & Grounding
Passion