1 Astrology
1.1 Origin
1.2 Color
Blue, Green, Greenish, Black
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1.3 Streak
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
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2.2 Solubility
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2.3 Durability
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2.4 Specific Gravity
2.5 Fracture
Conchoidal, Uneven
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2.6 Cleavage
Indistinct parting on [111]
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2.7 Mohs Hardness
1.4 Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
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2 Optical Properties
2.1 Luster
2.2 Pleochroism
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2.3 Dispersion
2.6 Transparency
Gemmological Tables (2004) More from other references
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2.7 Refractive Index
1.790-1.818Not Available
1
3.25
2.11 Optic Character
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2.12 Crystal System
2.13 Birefringence
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0
0.296
2.15 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
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3 Benefits
3.1 Physical
3.1.1 Neurological
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3.1.2 Cardiovascular
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3.1.3 Respiratory
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3.1.4 Reproductive
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3.1.5 Digestive
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3.2 Psychology
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3.3 Healing
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3.4 Qualities Associated
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