Corundum and Sodalite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
insoluble
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.90-4.05
  
2.15-2.40
  
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
  
Conchoidal, Uneven, UnevenArthur Thomas, Brittle
  
Cleavage
None – parting in 3 directions
  
Poor on {110}
  
Mohs Hardness
9
  
5-6
  
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
  
Na8Al6Si6O24Cl2
  
Corundum and Sodalite Chemical Formula
While comparing Corundum and Sodalite 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 Corundum and Sodalite chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Sodalite- Na8Al6Si6O24Cl2
Corundum and Sodalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.