Topaz and Feldspar Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.49-3.57
  
2.56-2.75
  
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)
  
Cleavage
[001] Perfect
  
two or three
  
Mohs Hardness
8
  
6-6.5
  
Chemical Composition
Al2SiO4(F,OH)2
  
Not Available
  
Topaz and Feldspar Chemical Formula
While comparing Topaz and Feldspar 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 Feldspar chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
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Topaz and Feldspar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Feldspar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Feldspar Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.56-2.75 whereas that of Feldspar is 2.56-2.75.