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Iolite
Iolite

Sheen Obsidian
Sheen Obsidian



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Iolite
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Sheen Obsidian
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.6-2.7
-
3,1
7-7.5
Mg2Al4Si5O18
 
-
-
-
2.33-2.50
Conchoidal
None
5-5.5
Volcanic glass