Sodalite and Austinite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Soluble
  
Easily soluble in cold dilute HCl
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.15-2.40
  
4.12
  
Fracture
Conchoidal, Uneven, UnevenArthur Thomas, Brittle
  
Brittle, Uneven, Brittle, Uneven
  
Cleavage
Poor on {110}
  
Good in two directions parallel to the prism faces {110}
  
Mohs Hardness
5-6
  
4-4.5
  
Chemical Composition
Na8Al6Si6O24Cl2
  
CaZn(AsO4)(OH)
  
Sodalite and Austinite Chemical Formula
While comparing Sodalite and Austinite 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 Sodalite and Austinite chemical formula.
- Chemical formula of Sodalite- Na8Al6Si6O24Cl2
- Chemical formula of Austinite- CaZn(AsO4)(OH)
Sodalite and Austinite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sodalite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sodalite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Sodalite is 4.12 whereas that of Austinite is 4.12.