Austinite and Hibonite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Easily soluble in cold dilute HCl
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.12
  
3.84
  
Fracture
Brittle, Uneven, Brittle, Uneven
  
Subconchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
  
Cleavage
Good in two directions parallel to the prism faces {110}
  
{0001} good, {10 1 0} parting
  
Mohs Hardness
4-4.5
  
7.5-8
  
Chemical Composition
CaZn(AsO4)(OH)
  
(Ca,Ce)(Al,Ti,Mg)12O19
  
Austinite and Hibonite Chemical Formula
While comparing Austinite and Hibonite 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 Hibonite chemical formula.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
- Chemical formula of Hibonite- (Ca,Ce)(Al,Ti,Mg)12O19
Austinite and Hibonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Austinite and Hibonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Hibonite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.84 whereas that of Hibonite is 3.84.