1 Astrology
1.1 Origin
Southern and central Africa
Southern and central Africa
1.2 Color
Black, Reddish, gray
Blue
1.3 Streak
1.4 For which Rashi?
Not Available
Not Available
1.5 Planet
Not Available
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1.6 Element of Planets
Not Available
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1.7 How to Wear?
1.7.1 Finger
Not Available
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1.7.2 Ring Metal
Not Available
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1.8 Energy
Not Available
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1.9 Deities
Not Available
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1.10 Not to wear with
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1.11 Powers
Not Available
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1.12 Birthstone
1.12.1 Planetary
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1.12.2 Talisman
Not Available
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2 Physical Properties
2.1 Tenacity
2.2 Solubility
Not Available
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2.3 Durability
Not Available
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2.4 Specific Gravity
5.51-5.643.25-3.50
1
7.18
1.4 Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Not Available
1.5 Cleavage
Distinct on {10 1 1}
Not Available
1.6 Mohs Hardness
1.9 Chemical Composition
Ag 3AsS 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Not Available
2 Optical Properties
2.1 Luster
2.2 Pleochroism
Moderate; cochineal-red to blood-red
Not Available
2.3 Dispersion
2.7 Transparency
OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references
Not Available
2.8 Refractive Index
2.792-3.0871.698-1.723
1
3.25
2.10 Optic Character
Not Available
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2.11 Crystal System
2.12 Birefringence
0.295-0.2960.001-0.012
0
0.296
2.13 Clarity
OpaqueUlrich Henn and Claudio C. Milisenda
Not Available
3 Benefits
3.1 Physical
3.1.1 Neurological
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3.1.2 Cardiovascular
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3.1.3 Respiratory
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3.1.4 Reproductive
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3.1.5 Digestive
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3.2 Psychology
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3.3 Healing
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3.4 Qualities Associated
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