Topaz and Agate Opal Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.49-3.57
  
1.98-2.50
  
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Conchoidal, Conchoidal, Gemstones of the world (2001)
  
Cleavage
[001] Perfect
  
Not Available
  
Mohs Hardness
8
  
5.5-6.5
  
Chemical Composition
Al2SiO4(F,OH)2
  
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
  
Topaz and Agate Opal Chemical Formula
While comparing Topaz and Agate 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 Agate Opal chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Agate Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Topaz and Agate Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Agate Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Agate Opal Optical Properties during the identification of gemstone. Specific gravity of Topaz is 1.98-2.50 whereas that of Agate Opal is 1.98-2.50.