1 Astrology
1.1 Origin
Brazil, Southern and central Africa
Switzerland
1.2 Color
Blue, Green, Black
Brown, Brownish, Yellow, Black, Reddish
1.3 Streak
1.4 For which Rashi?
Gemini, Sagittarius, Gemini, Sagittarius, Gemini, Sagittarius
Not Available
1.5 Planet
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
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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
Not Available
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2.3 Durability
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2.4 Specific Gravity
2.5 Fracture
Uneven, Uneven, Gemstones of the world (2001) More from other references
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
2.6 Cleavage
{001} Indistinct, {???} Indistinct
Distinct on {010}
2.7 Mohs Hardness
2.8 Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
3 Optical Properties
3.1 Luster
3.2 Pleochroism
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli
X = colorless; Y = pale yellow; Z = golden yellow
3.3 Dispersion
3.4 Transparency
Transparent, Translucent
Blue Chart Gem Identification (2010) More from other references
3.5 Refractive Index
1.604-1.6461.736-1.762
1
3.25
3.6 Optic Character
Not Available
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3.7 Crystal System
3.8 Birefringence
0.031-0.0360.009-0.015
0
0.296
3.9 Clarity
Transparent
Blue Chart Gem Identification (2010) More from other references
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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