Creedite and Poudretteite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.70
  
2.51-2.53
  
Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Conchoidal, Splintery
  
Cleavage
Perfect on {100}
  
None
  
Mohs Hardness
4.5
  
5
  
Chemical Composition
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
  
KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Creedite and Poudretteite Chemical Formula
While comparing Creedite and Poudretteite 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 Poudretteite chemical formula.
- Chemical formula of Creedite- Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
- Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)
Creedite and Poudretteite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Creedite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Creedite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Creedite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.