1 Astrology
1.1 Origin
Brazil, Kenya, Madagascar, Southern and central Africa
Not Available, Southern and central Africa
1.2 Color
Brown, Black
Violet, Black
1.3 Streak
White
gray, White, gray, White
1.4 For which Rashi?
Capricorn, Sagittarius
Not Available
1.5 Planet
1.6 Element of Planets
1.7 How to Wear?
1.7.1 Finger
Not Available
Not Available
1.7.2 Ring Metal
Not Available
Not Available
1.8 Energy
1.9 Deities
1.10 Not to wear with
Not Available
Not Available
1.11 Powers
1.12 Birthstone
1.12.1 Planetary
Not Available
Not Available
1.12.2 Talisman
Not Available
Not Available
2 Physical Properties
2.1 Tenacity
2.2 Solubility
Not Available
Not Available
2.3 Durability
Not Available
Not Available
2.4 Specific Gravity
2.5 Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Handbook of mineralogy (2001)
2.6 Cleavage
2.7 Mohs Hardness
2.8 Chemical Composition
SiO2
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
3 Optical Properties
3.1 Luster
3.2 Pleochroism
None
Strong: pale lavender dark blueAnthony et al
3.3 Dispersion
3.4 Transparency
Transparent, Translucent, Transparent to translucent
TranslucentAnthony et al, Translucent
3.5 Refractive Index
1.544-1.553Not Available
1
3.25
3.6 Optic Character
Not Available
Not Available
3.7 Crystal System
Hexagonal
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
3.8 Birefringence
0.009Not Available
0
0.296
3.9 Clarity
Opaque
TranslucentAnthony et al
4 Benefits
4.1 Physical
4.1.1 Neurological
Not Available
Not Available
4.1.2 Cardiovascular
Not Available
Not Available
4.1.3 Respiratory
Not Available
Not Available
4.1.4 Reproductive
Not Available
Not Available
4.1.5 Digestive
Not Available
Not Available
4.2 Psychology
Not Available
Not Available
4.3 Healing
Not Available
Not Available
4.4 Qualities Associated
Not Available
Not Available