Nickeline and Topaz Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
Not Available
  
3.49-3.57
  
Fracture
Conchoidal, Uneven
  
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Cleavage
{1010} Imperfect, {0001} Imperfect
  
[001] Perfect
  
Mohs Hardness
5-5.5
  
8
  
Chemical Composition
Not Available
  
Al2SiO4(F,OH)2
  
Nickeline and Topaz Chemical Formula
While comparing Nickeline and Topaz 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 Nickeline and Topaz chemical formula.
>- Chemical formula of Topaz- Al2SiO4(F,OH)2
Nickeline and Topaz Specific Gravity
Another important criteria for qualitative analysis of gemstones is Nickeline and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Nickeline and Topaz Optical Properties during the identification of gemstone. Specific gravity of Nickeline is 3.49-3.57 whereas that of Topaz is 3.49-3.57.