1 Astrology
1.1 Origin
Southern and central Africa
Southern and central Africa, Sixth Edition (2006)
1.2 Color
Black, Blue, Violet
Blue, Green, Blue, Brown
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
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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
Not Available
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2.4 Specific Gravity
2.95-3.132.00-2.45
1
7.18
2.5 Fracture
Not Available
Sub-Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
2.6 Cleavage
2.7 Mohs Hardness
2.8 Chemical Composition
Li 2[(Mg,Fe2+ ) 3Al 2]Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Cu2H2Si2O5(OH)4
3 Optical Properties
3.1 Luster
Vitreous
Vitreous, Greasy
3.2 Pleochroism
Strong in shades of violet when dark-colored.Anthony et al
AbsentWalter Schumann
3.3 Dispersion
3.4 Transparency
3.5 Refractive Index
1.622-1.6661.460-1.570
1
3.25
3.6 Optic Character
Not Available
Not Available
3.7 Crystal System
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
monoclinic
3.8 Birefringence
Not Available0.023-0.050
0
0.296
3.9 Clarity
Transparent
Gemmological Tables (2004) 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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