Alexandrite and Tourmaline Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.69-3.81
  
2.85-3.35
  
Fracture
Not Available
  
Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
1,1 ; 3,2.
  
Indistinct
  
Mohs Hardness
8.5
  
7-7.5
  
Chemical Composition
BeAl 2 O 4
  
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
  
Alexandrite and Tourmaline Chemical Formula
While comparing Alexandrite and Tourmaline 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 Alexandrite and Tourmaline chemical formula.
- Chemical formula of Alexandrite- BeAl 2 O 4
- Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Alexandrite and Tourmaline Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alexandrite and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.