Origin
Southern and central Africa
Brazil
Color
White, Colorless, Blue, Red, Green, Yellow, Violet, Black, Green, Red, Blue, White
Yellow, White, Brown, Brownish, Black
Streak
Colorless
Brown, Yellow, White
For which Rashi?
Not Available
Not Available
Planet
Not Available
Not Available
Element of Planets
Not Available
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Energy
Not Available
Not Available
Finger
Not Available
Not Available
Ring Metal
Not Available
Not Available
Deities
Not Available
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Not to wear with
Not Available
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Powers
Not Available
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Planetary
Not Available
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Talisman
Not Available
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Tenacity
Not Available
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Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
3.03-3.18
3.06-3.25
Fracture
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Sub-Conchoidal, ConchoidalArthur Thomas, Conchoidal, Uneven
Cleavage
{???} Indistinct
Poor/indistinct on {100}
Mohs Hardness
7-7.5
4.5-5
Chemical Composition
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
(Fe,Mn)AlPO 4(OH) 2 -H 2OArthur Thomas , Gemstones (2009)
Luster
Vitreous
Vitreous, Resinous
Pleochroism
Very strong: pale yellow colorless
visible
Transparency
Transparent
Transparent
Refractive Index
1.614-1.666
1.639-1.672
Optic Character
Not Available
Not Available
Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Orthorhombic
Birefringence
0.014-0.032
0.027-0.042
Clarity
Transparent
Transparent
Neurological
Not Available
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Cardiovascular
Not Available
Not Available
Respiratory
Not Available
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Reproductive
Not Available
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Digestive
Not Available
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Psychology
Not Available
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Healing
Not Available
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Qualities Associated
Not Available
Not Available