1 Astrology
1.1 Origin
Southern and central Africa
Italy, China
1.2 Color
Violet, Blue, Red, Yellow, Brown, gray
Colorless, White, Blue, gray
1.3 Streak
1.4 For which Rashi?
Not Available
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1.5 Planet
Not Available
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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
2.5 Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
White, Yellow, Pale blue, Brittle, Uneven
2.6 Cleavage
None – parting in 3 directions
Perfect on {100} and {010}, imperfect on {101}
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, Greasy
3.2 Pleochroism
3.3 Dispersion
3.4 Transparency
Transparent, Translucent
Not Available
3.5 Refractive Index
1.758-1.7801.672-1.676
1
3.25
3.6 Optic Character
Not Available
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3.7 Crystal System
3.8 Birefringence
0.007-0.0100.019-0.021
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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