1 Astrology
1.1 Origin
1.2 Color
Red, Colorless, Red
Blue, gray, Black, Blue
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
2.9 Fracture
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Uneven
Conchoidal, Brittle, Conchoidal
2.11 Cleavage
None
Good on [110] and on [001]
2.12 Mohs Hardness
2.13 Chemical Composition
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
[ ]Na2(Mg3Al2)Si8O22(OH)2
3 Optical Properties
3.1 Luster
Vitreous
Vitreous, Pearly
4.2 Pleochroism
4.3 Dispersion
4.7 Transparency
Gemmological Tables (2004) More from other references
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4.8 Refractive Index
1.735-1.7451.606-1.637
1
3.25
4.9 Optic Character
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4.10 Crystal System
4.11 Birefringence
0.012Not Available
0
0.296
4.12 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
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5 Benefits
5.1 Physical
5.1.1 Neurological
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5.1.2 Cardiovascular
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5.1.3 Respiratory
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5.1.4 Reproductive
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5.1.5 Digestive
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5.2 Psychology
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5.3 Healing
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5.4 Qualities Associated
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