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Tugtupite
Tugtupite
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Iolite
Iolite
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Tugtupite
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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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2.30-2.60
Uneven, Conchoidal
{111} Imperfect
5.5-6
Na 4AlBeSi 4O 12ClMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
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2.6-2.7
-
3,1
7-7.5
Mg2Al4Si5O18

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