1 Astrology
1.1 Origin
Not Available
Canada, Madagascar, Southern and central Africa, Sri Lanka, USA
1.2 Color
Black, Blue, Yellow, Green
Violet, Blue
1.3 Streak
Grey, Greenish, Brown
Not Available
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
3.28-3.442.56-2.66
1
7.18
2.5 Fracture
Uneven, Splintery, Brittle
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
2.6 Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
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2.7 Mohs Hardness
2.8 Chemical Composition
Not Available
Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
3 Optical Properties
3.1 Luster
3.2 Pleochroism
X = blue
Strong trichroism: colorless to yellowish
3.3 Dispersion
3.4 Transparency
Not Available
Transparent
3.5 Refractive Index
1.680-1.6981.542-1.578
1
3.25
3.6 Optic Character
3.7 Crystal System
3.8 Birefringence
0.005-0.0080.008-0.012
0
0.296
3.9 Clarity
Not Available
Transparent
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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