Origin
Southern and central Africa
Australia, Brazil, Canada, Colombia, Madagascar, Zimbabwe
Color
Black, Brownish, Brown
Brown
Streak
Brown
Brownish, Red, Black
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
4.5-4.85.2
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
None, parting may develop along {111}
Good in one direction
Mohs Hardness
5.56-6.5
2
10
👆🏻
Chemical Composition
Fe++Cr2O4
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
Luster
-
Resinous
Pleochroism
none.
-
Dispersion
0.040.03
0.005
1
👆🏻
Transparency
-
TransparentWalter Schumann
Refractive Index
2.08-2.162.190-2.457
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Isometric
Orthorhombic
Birefringence
-99990.083
0
0.296
👆🏻
Clarity
-
TransparentWalter Schumann
Physical
Neurological
-
-
Cardiovascular
-
-
Respiratory
Poor
-
Reproductive
-
-
Digestive
-
-
Psychology
Vitality
Strength
Healing
Emotional healing
Emotional healing
Qualities Associated
Protection
Balance