1 Astrology
1.1 Origin
1.2 Color
Brown, Brownish, Yellow, Black, Reddish
Blue
1.3 Streak
White, gray
Not Available
1.4 For which Rashi?
Not Available
Sagittarius, Scorpio
1.5 Planet
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
Not Available
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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
Not Available
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2.3 Durability
Not Available
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2.4 Specific Gravity
2.5 Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009)
2.6 Cleavage
Distinct on {010}
None, but may exhibit slight parting
2.7 Mohs Hardness
2.8 Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
3 Optical Properties
3.1 Luster
3.2 Pleochroism
X = colorless; Y = pale yellow; Z = golden yellow
AbsentWalter Schumann
3.3 Dispersion
3.4 Transparency
Blue Chart Gem Identification (2010) More from other references
Gemmological Tables (2004)
3.5 Refractive Index
1.736-1.7621.735-1.790
1
3.25
3.6 Optic Character
Not Available
Not Available
3.7 Crystal System
3.8 Birefringence
0.009-0.015Not Available
0
0.296
3.9 Clarity
Blue Chart Gem Identification (2010) More from other references
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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