1 Astrology
1.1 Origin
Not Available
USA, Brazyl, Switzerland, Tanzania, Madagascar, Russia, Sri Lanka
1.2 Color
Blue, gray, Black, Blue
Colorless, Yellow, pink, Red
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
Conchoidal, Brittle, Conchoidal
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
2.6 Cleavage
Good on [110] and on [001]
Distinct on {11 2 0}, imperfect on {10 1 1}
2.7 Mohs Hardness
2.8 Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
3 Optical Properties
3.1 Luster
Vitreous, Pearly
Vitreous
3.2 Pleochroism
Strong
Distinct: colorless orangy-yellowHerve Nicolas Lazzarelli
3.3 Dispersion
3.4 Transparency
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Gemmological Tables (2004) More from other references
3.5 Refractive Index
1.606-1.6371.650-1.695
1
3.25
3.6 Optic Character
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3.7 Crystal System
3.8 Birefringence
Not Available0.016
0
0.296
3.9 Clarity
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TransparentUlrich Henn and Claudio C. Milisenda
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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