1 Astrology
1.1 Origin
Southern and central Africa
Brazil
1.2 Color
Brown, Black
Blue, Greenish
1.3 Streak
1.4 For which Rashi?
Cancer, Leo, Cancer, Leo, Cancer, Leo
Not Available
1.5 Planet
Mars, Saturn
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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
1.9 Deities
1.10 Not to wear with
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1.11 Powers
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
2.6 Cleavage
2.7 Mohs Hardness
2.8 Chemical Composition
Not Available
(Fe2+ ,Mg)Al 2(PO 4) 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
3 Optical Properties
3.1 Luster
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3.2 Pleochroism
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Colorless blueAnthony et al
3.3 Dispersion
3.4 Transparency
Not Available
Gemmological Tables (2004) More from other references
3.5 Refractive Index
Not Available1.639-1.680
1
3.25
3.6 Optic Character
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3.7 Crystal System
Not Available
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3.8 Birefringence
Not Available0.041
0
0.296
3.9 Clarity
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TransparentUlrich Henn and Claudio C. Milisenda
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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