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Opal
Opal
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Halite
Halite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O
 
Brittle
Water-soluble
-
2.17
Conchoidal
Perfect {001}, three directions cubic
2.0-2.5
NaCl