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Jet
Jet

Heliotrope
Heliotrope



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Heliotrope
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.19-1.35
ConchoidalWalter Schumann
None
2.5-4
C
 
-
-
-
2.61
-
None
6.5-7
SiO2