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Tantalite
Tantalite
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Iolite
Iolite
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Tantalite
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Iolite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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-
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5.2
Subconchoidal, Conchoidal
Good in one direction
6-6.5
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references
 
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-
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2.6-2.7
-
3,1
7-7.5
Mg2Al4Si5O18

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