1 Astrology
1.1 Origin
Brazil, Southern and central Africa
Sri Lanka
1.2 Color
Blue, Green, Black
Red, Brown, Black
1.3 Streak
1.4 For which Rashi?
Gemini, Sagittarius, Gemini, Sagittarius, Gemini, Sagittarius
Not Available
1.7 Planet
2.1 Element of Planets
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2.3 Energy
2.6 How to Wear?
2.6.1 Finger
Not Available
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2.7.1 Ring Metal
Not Available
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2.8 Deities
2.9 Not to wear with
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2.10 Powers
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2.11 Birthstone
2.11.1 Planetary
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2.11.2 Talisman
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3 Physical Properties
3.1 Tenacity
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3.2 Solubility
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3.3 Durability
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3.4 Specific Gravity
3.04-3.172.97-3.14
1
7.18
5.8 Fracture
Uneven, Uneven, Gemstones of the world (2001) More from other references
Uneven, Conchoidal, Brittle
5.9 Cleavage
{001} Indistinct, {???} Indistinct
{1011} Indistinct
5.10 Mohs Hardness
6.7 Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
7 Optical Properties
7.1 Luster
7.2 Pleochroism
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli
Pale yellow colorlessAnthony et al
7.3 Dispersion
9.2 Transparency
Transparent, Translucent
Transparent
9.4 Refractive Index
1.604-1.6461.614-1.666
1
3.25
9.7 Optic Character
Not Available
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9.8 Crystal System
9.9 Birefringence
0.031-0.0360.014-0.032
0
0.296
9.10 Clarity
10 Benefits
10.1 Physical
10.1.1 Neurological
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10.1.2 Cardiovascular
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10.1.3 Respiratory
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10.1.4 Reproductive
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10.1.5 Digestive
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10.2 Psychology
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10.3 Healing
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10.4 Qualities Associated
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