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Boulder Opal
Boulder Opal

Common Opal
Common Opal



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Boulder Opal
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Common Opal

Boulder Opal and Common Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.98-2.25
Conchoidal
None
5-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.
 
-
-
-
1.98-2.50
Conchoidal
None
5.5-6.5
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Boulder Opal and Common Opal Chemical Formula

While comparing Boulder Opal and Common Opal physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Boulder Opal and Common Opal chemical formula.

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Boulder Opal and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal Vs Common Opal during the identification of gemstone. Specific gravity of Boulder Opal is whereas that of Common Opal is .