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Rhyolite
Rhyolite

Opal
Opal



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Rhyolite
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Opal
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
-9999
-
None
7
70% SiO2, Al2O3, Na2O, K2O
 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O