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Common Opal
Common Opal

Amethyst
Amethyst



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Common Opal
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Amethyst

Common Opal and Amethyst 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)
 
-
insoluble in common solvents
-
2.65
Conchoidal, ConchoidalWalter Schumann
Indiscernible
7
SiO2

Common Opal and Amethyst Chemical Formula

While comparing Common Opal and Amethyst 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 Amethyst chemical formula.

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Common Opal and Amethyst Specific Gravity

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