Celestine and Gypsum Physical Properties
Tenacity
Brittle
  
Flexible
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.90-4.00
  
2.20-2.40
  
Fracture
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
  
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
  
Cleavage
Perfect on {001}, good on {210}, poor on {010}
  
Perfect on {010}, distinct on {100}
  
Mohs Hardness
3-3.5
  
2
  
Chemical Composition
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
  
Celestine and Gypsum Chemical Formula
While comparing Celestine and Gypsum 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 Celestine and Gypsum chemical formula.
- Chemical formula of Celestine- SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Celestine and Gypsum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Celestine and Gypsum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Celestine and Gypsum Optical Properties during the identification of gemstone. Specific gravity of Celestine is 2.20-2.40 whereas that of Gypsum is 2.20-2.40.