Creedite and Austinite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Easily soluble in cold dilute HCl
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.70
  
4.12
  
Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Brittle, Uneven, Brittle, Uneven
  
Cleavage
Perfect on {100}
  
Good in two directions parallel to the prism faces {110}
  
Mohs Hardness
4.5
  
4-4.5
  
Chemical Composition
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
  
CaZn(AsO4)(OH)
  
Creedite and Austinite Chemical Formula
While comparing Creedite 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 Creedite and Austinite chemical formula.
- Chemical formula of Creedite- Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
- Chemical formula of Austinite- CaZn(AsO4)(OH)
Creedite and Austinite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Creedite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Creedite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Creedite is 4.12 whereas that of Austinite is 4.12.