Origin
India, Southern and central Africa, Madagascar
USA, Southern and central Africa, China, India, Italy
Color
Black, Brownish, Greenish
White, Yellow
Streak
Brown
-
For which Rashi?
-
Gemini
Planet
-
Saturn
Element of Planets
-
-
Energy
-
-
How to Wear?
Finger
-
-
Ring Metal
-
-
Deities
-
-
Not to wear with
-
-
Powers
-
Healing
Birthstone
Planetary
-
-
Talisman
-
-
Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.18-3.222.44-2.62
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven
Cleavage
{1011} Indistinct
Indiscernible
Mohs Hardness
-99992.5-5.5
2
10
👆🏻
Chemical Composition
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Luster
Vitreous
Vitreous, Greasy, Silky
Pleochroism
Very strong: yellow-brown pale yellow
-
Dispersion
0.020.01
0.005
1
👆🏻
Transparency
Transparent, Translucent
Translucent
Refractive Index
1.635-1.6721.560-1.571
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
monoclinic
Birefringence
0.0250.008-0.014
0
0.296
👆🏻
Clarity
Transparent
Translucent
Physical
Neurological
-
Aids in mental clarity and focus
Cardiovascular
-
-
Respiratory
Good
Good
Reproductive
-
-
Digestive
-
-
Psychology
Protection
Transformation
Healing
Emotional healing
Emotional healing
Qualities Associated
Protection & Grounding
Protection