Gypsum and Alexandrite Physical Properties
Tenacity
Flexible
  
Not Available
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.20-2.40
  
3.69-3.81
  
Fracture
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
  
Not Available
  
Cleavage
Perfect on {010}, distinct on {100}
  
1,1 ; 3,2.
  
Mohs Hardness
2
  
8.5
  
Chemical Composition
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
  
BeAl 2 O 4
  
Gypsum and Alexandrite Chemical Formula
While comparing Gypsum and Alexandrite 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 Gypsum and Alexandrite chemical formula.
- Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
- Chemical formula of Alexandrite- BeAl 2 O 4
Gypsum and Alexandrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Gypsum and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gypsum and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Gypsum is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.