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Wood Opal
Wood Opal

Halite
Halite



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Wood Opal
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Halite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.98-2.50
-
None
5.5-6.5
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
 
Brittle
Water-soluble
-
2.17
Conchoidal
Perfect {001}, three directions cubic
2.0-2.5
NaCl