1 Astrology
1.1 Origin
Southern and central Africa, Sixth Edition (2006)
Southern and central Africa
1.2 Color
Blue, Green, Blue, Brown
Yellow, Brown, Black, Black
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
Not Available
Not Available
1.7.2 Ring Metal
Not Available
Not Available
1.8 Energy
1.9 Deities
1.10 Not to wear with
Not Available
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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
Not Available
Not Available
2.3 Durability
Not Available
Not Available
2.4 Specific Gravity
2.5 Fracture
Sub-Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
2.6 Cleavage
none
{010} moderate, {100} imperfect
2.7 Mohs Hardness
2.8 Chemical Composition
Cu2H2Si2O5(OH)4
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
3 Optical Properties
3.1 Luster
Vitreous, Greasy
Vitreous, Resinous
3.2 Pleochroism
AbsentWalter Schumann
Faint
3.3 Dispersion
3.4 Transparency
Opaque
TransparentAnthony et al, Handbook of mineralogy (2001)
3.5 Refractive Index
1.460-1.5701.827-1.879
1
3.25
3.6 Optic Character
Not Available
Not Available
3.7 Crystal System
3.8 Birefringence
0.023-0.0500.042-0.051
0
0.296
3.9 Clarity
Gemmological Tables (2004) More from other references
TransparentAnthony et al
4 Benefits
4.1 Physical
4.1.1 Neurological
Not Available
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4.1.2 Cardiovascular
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4.1.3 Respiratory
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4.1.4 Reproductive
Not Available
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4.1.5 Digestive
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4.2 Psychology
Not Available
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4.3 Healing
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4.4 Qualities Associated
Not Available
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