1 Astrology
1.1 Origin
Southern and central Africa
Tanzania, Madagascar, Kenya, Sri Lanka, Burma, Australia
1.2 Color
White, Colorless, Blue, Red, Green, Yellow, Violet, Black, Green, Red, Blue, White
Green, Brown, Colorless, Greenish, Yellow
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
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2.2 Solubility
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2.3 Durability
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2.4 Specific Gravity
3.03-3.183.25-3.45
1
7.18
2.5 Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Uneven
2.6 Cleavage
{???} Indistinct
Good on {110}
2.7 Mohs Hardness
2.8 Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references
3 Optical Properties
3.1 Luster
3.2 Pleochroism
Very strong: pale yellow colorless
X = colorless to green; Y = colorless
3.3 Dispersion
3.4 Transparency
Transparent
Gemmological Tables (2004) More from other references
3.5 Refractive Index
1.614-1.6661.660-1.685
1
3.25
3.6 Optic Character
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3.7 Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Orthorhombic
3.8 Birefringence
0.014-0.0320.012-0.017
0
0.296
3.9 Clarity
Transparent
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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