Austinite and Spinel Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Easily soluble in cold dilute HCl
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.12
  
3.64-3.66
  
Fracture
Brittle, Uneven, Brittle, Uneven
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Good in two directions parallel to the prism faces {110}
  
None, but may exhibit slight parting
  
Mohs Hardness
4-4.5
  
8
  
Chemical Composition
CaZn(AsO4)(OH)
  
MgAl2O4
  
Austinite and Spinel Chemical Formula
While comparing Austinite 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 Austinite and Spinel chemical formula.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
- Chemical formula of Spinel- MgAl2O4
Austinite and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Austinite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.