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White Opal
White Opal

Black Opal
Black Opal



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White Opal
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Black Opal

White Opal and Black Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.98-2.50
Conchoidal
None
5.5-6.5
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

White Opal and Black Opal Chemical Formula

While comparing White Opal and Black 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 White Opal and Black Opal chemical formula.

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White Opal and Black Opal Specific Gravity

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