Origin
Australia, Brazil, Burma, Canada, India, Madagascar, Sri Lanka, Tanzania
Southern and central Africa
Color
Blue, Violet, Greenish, Brown, Colorless, Yellow, gray
Black, Brownish, White, Brown
Streak
White
Reddish, Black
For which Rashi?
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Planet
-
-
Element of Planets
-
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Energy
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How to Wear?
Finger
-
-
Ring Metal
-
-
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
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.57-2.664.76-5.03
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
Fair on {100}, poor on {001} and {010}
None
Mohs Hardness
7-7.55.5-6.5
2
10
👆🏻
Chemical Composition
Mg2Al4Si5O18
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)