Origin
Southern and central Africa
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Color
Violet, Black
Brown, Blue, Green, Yellow, White
Streak
gray, White
White
For which Rashi?
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Planet
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Element of Planets
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Energy
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How to Wear?
Finger
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Ring Metal
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Deities
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Not to wear with
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Powers
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Birthstone
Planetary
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Talisman
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Tenacity
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Solubility
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Durability
-
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Specific Gravity
3.173.32-3.43
1
7.18
👆🏻
Fracture
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Conchoidal
Cleavage
None
Poor on {110} and {100} very poor on {001}
Mohs Hardness
76-7
2
10
👆🏻
Chemical Composition
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
Luster
Vitreous
Vitreous, Resinous
Pleochroism
Strong: pale lavender dark blueAnthony et al
slight in colored varieties
Dispersion
0.020.03
0.005
1
👆🏻
Transparency
TranslucentAnthony et al, Translucent
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Refractive Index
-99991.703-1.752
1
3.25
👆🏻
Optic Character
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Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
tetragonal
Birefringence
-99990.004-0.006
0
0.296
👆🏻
Clarity
TranslucentAnthony et al
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Physical
Neurological
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Enhances mental clarity and focus
Cardiovascular
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Supports heart health
Respiratory
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Good
Reproductive
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Digestive
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Psychology
Empowerment
Transformation
Healing
Emotional healing
Emotional healing
Qualities Associated
Emotional Healing
Transformation