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Common Opal
Common Opal

Alunite
Alunite



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Common Opal
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Alunite

Common Opal and Alunite 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)
 
Brittle
Soluble
-
2.6-2.9
Conchoidal, Uneven
On {0001}, perfect
3.5-4
KAl3(SO4)2(OH)6

Common Opal and Alunite Chemical Formula

While comparing Common Opal and Alunite 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 Common Opal and Alunite chemical formula.

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Common Opal and Alunite Specific Gravity

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