Cinnabar and Gypsum Physical Properties
Tenacity
Slightly sectile
  
Flexible
  
Solubility
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2
  
2.20-2.40
  
Fracture
Uneven, Uneven, Gemstones (2009), Brittle
  
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
  
Cleavage
Prismatic {10 1 0}, perfect
  
Perfect on {010}, distinct on {100}
  
Mohs Hardness
2-2.5
  
2
  
Chemical Composition
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
  
Cinnabar and Gypsum Chemical Formula
While comparing Cinnabar 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 Cinnabar and Gypsum chemical formula.
- Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Cinnabar and Gypsum Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cinnabar and Gypsum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Gypsum Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 2.20-2.40 whereas that of Gypsum is 2.20-2.40.