Topaz and Spinel Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.49-3.57
  
3.64-3.66
  
Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
[001] Perfect
  
None, but may exhibit slight parting
  
Mohs Hardness
8
  
8
  
Chemical Composition
Al2SiO4(F,OH)2
  
MgAl2O4
  
Topaz and Spinel Chemical Formula
While comparing Topaz and Spinel 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 Spinel chemical formula.
- Chemical formula of Topaz- Al2SiO4(F,OH)2
- Chemical formula of Spinel- MgAl2O4
Topaz and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Topaz and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Spinel Optical Properties during the identification of gemstone. Specific gravity of Topaz is 3.64-3.66 whereas that of Spinel is 3.64-3.66.