Zinnwaldite and Austinite Physical Properties
Tenacity
Elastic
  
Brittle
  
Solubility
Not Available
  
Easily soluble in cold dilute HCl
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.9-3.1
  
4.12
  
Fracture
Uneven
  
Brittle, Uneven, Brittle, Uneven
  
Cleavage
Perfect basal {001}
  
Good in two directions parallel to the prism faces {110}
  
Mohs Hardness
3.5-4.0
  
4-4.5
  
Chemical Composition
Not Available
  
CaZn(AsO4)(OH)
  
Zinnwaldite and Austinite Chemical Formula
While comparing Zinnwaldite 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 Zinnwaldite and Austinite chemical formula.
>- Chemical formula of Austinite- CaZn(AsO4)(OH)
Zinnwaldite and Austinite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Zinnwaldite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zinnwaldite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Zinnwaldite is 4.12 whereas that of Austinite is 4.12.