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Hackmanite
Hackmanite

Tinaksite
Tinaksite



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Hackmanite
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Tinaksite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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-
-
2.27-2.33
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Perfect
5.5-6
Na 8Al 6Si 6O 24Cl 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
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-
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2.82
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Perfect in one direction, indistinct in one direction
6
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]