Astrology
Origin
Not Available
Southern and central Africa
Color
Black, Blue, Yellow, Green
White, Colorless, Blue, Red, Green, Yellow, Violet
Streak
Grey, Greenish, Brown
Not Available
For which Rashi?
Not Available
Not Available
Planet
Not Available
Not Available
Element of Planets
Not Available
Not Available
Energy
Not Available
Not Available
How to Wear?
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Deities
Not Available
Not Available
Not to wear with
Not Available
Not Available
Powers
Not Available
Not Available
Birthstone
Planetary
Not Available
Not Available
Talisman
Not Available
Not Available
Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.28-3.44
2.58-2.63
Fracture
Uneven, Splintery, Brittle
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
Not Available
Mohs Hardness
5.0-6.0
6.5-7
Chemical Composition
Not Available
SiO 2Ulrich Henn and Claudio C.
Optical Properties
Luster
Vitreous, Silky
Waxy
Pleochroism
X = blue
AbsentWalter Schumann
Dispersion
Not Available
None
Transparency
Not Available
Translucent
Refractive Index
1.680-1.698
1.535-1.539
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Not Available
Birefringence
0.005-0.008
0.008-0.010
Clarity
Not Available
Translucent
Benefits
Physical
Neurological
Not Available
Not Available
Cardiovascular
Not Available
Not Available
Respiratory
Not Available
Not Available
Reproductive
Not Available
Not Available
Digestive
Not Available
Not Available
Psychology
Not Available
Not Available
Healing
Not Available
Not Available
Qualities Associated
Not Available
Not Available
