1 Astrology
1.1 Origin
Southern and central Africa, Sixth Edition (2006)
Tanzania, Sri Lanka, China
1.2 Color
Blue, Green, Blue, Brown
Colorless
1.3 Streak
1.4 For which Rashi?
1.5 Planet
1.6 Element of Planets
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
2.2 Solubility
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2.3 Durability
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2.4 Specific Gravity
2.00-2.453.60-3.61
1
7.18
2.5 Fracture
Sub-Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Conchoidal
2.6 Cleavage
none
Imperfect/fair/absent
2.7 Mohs Hardness
2.8 Chemical Composition
Cu2H2Si2O5(OH)4
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
3 Optical Properties
3.1 Luster
Vitreous, Greasy
Vitreous
3.2 Pleochroism
AbsentWalter Schumann
Weak
3.3 Dispersion
3.4 Transparency
Opaque
Gemmological Tables (2004) More from other references
3.5 Refractive Index
1.460-1.5701.70-1.73
1
3.25
3.6 Optic Character
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3.7 Crystal System
3.8 Birefringence
3.9 Clarity
Gemmological Tables (2004) More from other references
Color grading system
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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