Origin
India, Southern and central Africa, Madagascar
Brazil, Colombia, Southern and central Africa
Color
Black, Brownish, Greenish
Greenish, Blue, Colorless, White, Green
For which Rashi?
Not Available
Not Available
Planet
Not Available
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Element of Planets
Not Available
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Energy
Not Available
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Finger
Not Available
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Ring Metal
Not Available
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Deities
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Not to wear with
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Powers
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Planetary
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Talisman
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Tenacity
Not Available
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Solubility
Not Available
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Durability
Not Available
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Specific Gravity
3.18-3.22
3.08-3.12
Fracture
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle, Metallic
Cleavage
{1011} Indistinct
{010} Perfect
Mohs Hardness
Not Available
7.5
Chemical Composition
Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pleochroism
Very strong: yellow-brown pale yellow
Weak: colorless-(greenish) yellow
Transparency
Transparent, Translucent
Gemmological Tables (2004) More from other references
Refractive Index
1.635-1.672
1.650-1.677
Optic Character
Not Available
Not Available
Crystal System
Not Available
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a
Birefringence
0.025
0.019-0.025
Clarity
Transparent
TransparentUlrich Henn and Claudio C. Milisenda
Neurological
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Cardiovascular
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Respiratory
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Reproductive
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Digestive
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Psychology
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Healing
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Qualities Associated
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