Austinite and Fluorapatite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Easily soluble in cold dilute HCl
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.12
  
3.1-3.25
  
Fracture
Brittle, Uneven, Brittle, Uneven
  
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
  
Cleavage
Good in two directions parallel to the prism faces {110}
  
Indistinct
  
Mohs Hardness
4-4.5
  
5
  
Chemical Composition
CaZn(AsO4)(OH)
  
Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
  
Austinite and Fluorapatite Chemical Formula
While comparing Austinite and Fluorapatite 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 Fluorapatite chemical formula.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
- Chemical formula of Fluorapatite- Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
Austinite and Fluorapatite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Austinite and Fluorapatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Fluorapatite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.1-3.25 whereas that of Fluorapatite is 3.1-3.25.