1 Astrology
1.1 Origin
Southern and central Africa
Not Available
1.2 Color
Violet, Blue, Red, Yellow, Brown, gray
Black, Blue, Yellow, Green
1.3 Streak
White, None
Grey, Greenish, Brown
1.4 For which Rashi?
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1.5 Planet
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1.6 Element of Planets
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1.7 How to Wear?
1.7.1 Finger
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1.7.2 Ring Metal
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1.8 Energy
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1.9 Deities
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1.10 Not to wear with
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1.11 Powers
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1.12 Birthstone
1.12.1 Planetary
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1.12.2 Talisman
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2 Physical Properties
2.1 Tenacity
2.2 Solubility
2.3 Durability
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2.4 Specific Gravity
3.90-4.053.28-3.44
1
7.18
2.5 Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
Uneven, Splintery, Brittle
2.6 Cleavage
None – parting in 3 directions
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
2.7 Mohs Hardness
2.8 Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
Not Available
3 Optical Properties
3.1 Luster
Adamantine, Vitreous
Vitreous, Silky
3.2 Pleochroism
3.3 Dispersion
3.4 Transparency
Transparent, Translucent
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3.5 Refractive Index
1.758-1.7801.680-1.698
1
3.25
3.6 Optic Character
Not Available
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3.7 Crystal System
3.8 Birefringence
0.007-0.0100.005-0.008
0
0.296
3.9 Clarity
Gemmological Tables (2004) More from other references
Not Available
4 Benefits
4.1 Physical
4.1.1 Neurological
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4.1.2 Cardiovascular
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4.1.3 Respiratory
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4.1.4 Reproductive
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4.1.5 Digestive
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4.2 Psychology
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4.3 Healing
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4.4 Qualities Associated
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