Austinite and Star Sapphire Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Easily soluble in cold dilute HCl
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.12
  
3.90-4.05
  
Fracture
Brittle, Uneven, Brittle, Uneven
  
Not Available
  
Cleavage
Good in two directions parallel to the prism faces {110}
  
Not Available
  
Mohs Hardness
4-4.5
  
Not Available
  
Chemical Composition
CaZn(AsO4)(OH)
  
Al 2O 3Ulrich Henn and Claudio C.
  
Austinite and Star Sapphire Chemical Formula
While comparing Austinite and Star Sapphire 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 Star Sapphire chemical formula.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
- Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.
Austinite and Star Sapphire Specific Gravity
Another important criteria for qualitative analysis of gemstones is Austinite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.