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Topaz
Topaz

Common Opal
Common Opal



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Topaz
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Common Opal

Topaz and Common Opal Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.49-3.571.98-2.50
Amber
1 7.18
1.5 Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Conchoidal, Conchoidal, Gemstones of the world (2001)
1.6 Cleavage
[001] Perfect
Not Available
1.7 Mohs Hardness
85.5-6.5
Amber
2 10
1.8 Chemical Composition
Al2SiO4(F,OH)2
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Topaz and Common Opal Chemical Formula

While comparing Topaz 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 Topaz and Common Opal chemical formula.

  • Chemical formula of Topaz- Al2SiO4(F,OH)2
  • Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Topaz and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Topaz is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.