1 Astrology
1.1 Origin
USA, Madagascar, India, Sri Lanka, Burma, Australia, Italy, Brazil
Mexico
1.2 Color
Blue, Green, Brownish, Greenish, Colorless, gray
Blue, Blue, Black
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
2.2 Solubility
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2.3 Durability
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2.4 Specific Gravity
2.5 Fracture
Splintery
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
2.6 Cleavage
{010} perfect
Perfect on {0001}
2.7 Mohs Hardness
2.8 Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
3 Optical Properties
3.1 Luster
Vitreous, Subadamantine, Silky
Resinous
3.2 Pleochroism
Colourless to pale brown to yellow
Marked
3.3 Dispersion
3.4 Transparency
Transparent, Translucent
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references
3.5 Refractive Index
1.653-1.6851.45-2.62
1
3.25
3.6 Optic Character
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3.7 Crystal System
3.8 Birefringence
0.020-0.022Not Available
0
0.296
3.9 Clarity
Transparent
OpaqueAnthony et al
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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