Topaz and Poudretteite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.49-3.57
  
2.51-2.53
  
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Conchoidal, Splintery
  
Cleavage
[001] Perfect
  
None
  
Mohs Hardness
8
  
5
  
Chemical Composition
Al2SiO4(F,OH)2
  
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Topaz and Poudretteite Chemical Formula
While comparing Topaz and Poudretteite 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 Poudretteite chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
Topaz and Poudretteite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.