1 Astrology
1.1 Origin
Tanzania
Not Available, Southern and central Africa
1.2 Color
Green, Black, Blue
Violet, Black
1.3 Streak
Not Available
gray, White, gray, White
1.4 For which Rashi?
Not Available
Not Available
1.5 Planet
Not Available
Not Available
1.6 Element of Planets
Not Available
Not Available
1.7 Energy
Not Available
Not Available
1.8 How to Wear?
1.8.1 Finger
Not Available
Not Available
1.8.2 Ring Metal
Not Available
Not Available
1.9 Deities
Not Available
Not Available
1.10 Not to wear with
Not Available
Not Available
1.11 Powers
Not Available
Not Available
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
Not Available
Not Available
2.2 Solubility
Not Available
Not Available
2.3 Durability
Not Available
Not Available
2.4 Specific Gravity
2.17 Fracture
Not Available
Handbook of mineralogy (2001)
2.18 Cleavage
2.19 Mohs Hardness
6.6 Chemical Composition
Not Available
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
7 Optical Properties
7.1 Luster
7.2 Pleochroism
Not Available
Strong: pale lavender dark blueAnthony et al
7.3 Dispersion
7.12 Transparency
Not Available
TranslucentAnthony et al, Translucent
7.13 Refractive Index
1.695Not Available
1
3.25
7.26 Optic Character
Not Available
Not Available
7.27 Crystal System
Not Available
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
7.28 Birefringence
Not AvailableNot Available
0
0.296
11.8 Clarity
Not Available
TranslucentAnthony et al
12 Benefits
12.1 Physical
12.1.1 Neurological
Not Available
Not Available
12.1.2 Cardiovascular
Not Available
Not Available
12.1.3 Respiratory
Not Available
Not Available
12.1.4 Reproductive
Not Available
Not Available
12.1.5 Digestive
Not Available
Not Available
12.2 Psychology
Not Available
Not Available
12.3 Healing
Not Available
Not Available
12.4 Qualities Associated
Not Available
Not Available