Origin
USA, Mexico, Tanzania, Brazil, Pakistan, Afghanistan, Origins: USA
Southern and central Africa
Color
Green, Reddish, Brown, Yellow, Colorless, Blue, Violet, Grey
Black, Brownish, Brown
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
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.364.5-4.8
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Good on {100}
None, parting may develop along {111}
Mohs Hardness
6.5-75.5
2
10
👆🏻
Chemical Composition
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Fe++Cr2O4
Luster
Vitreous
-
Pleochroism
Strong
none.
Dispersion
0.020.04
0.005
1
👆🏻
Transparency
-
-
Refractive Index
1.656-1.7042.08-2.16
1
3.25
👆🏻
Optic Character
Biaxial/+
-
Crystal System
Triclinic
Isometric
Birefringence
0.009-0.012-9999
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
-
Physical
Neurological
Enhances mental clarity and focus
-
Cardiovascular
-
-
Respiratory
Good
Poor
Reproductive
-
-
Digestive
-
-
Psychology
Harmony
Vitality
Healing
Emotional healing
Emotional healing
Qualities Associated
Balance
Protection