Tanzanite and Zoisite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Hard
  
Not Available
  
Specific Gravity
3.35
  
3.20-3.50
  
Fracture
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
  
Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Even
  
Cleavage
Perfect {010}, imperfect {100}
  
Perfect {010} imperfect {100}
  
Mohs Hardness
6.5-7
  
6-7
  
Chemical Composition
Ca2Al3(SiO4)3(OH)
  
Ca2Al3(SiO4)3(OH)
  
Tanzanite and Zoisite Chemical Formula
While comparing Tanzanite and Zoisite 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 Tanzanite and Zoisite chemical formula.
- Chemical formula of Tanzanite- Ca2Al3(SiO4)3(OH)
- Chemical formula of Zoisite- Ca2Al3(SiO4)3(OH)
Tanzanite and Zoisite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Tanzanite and Zoisite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Tanzanite and Zoisite Optical Properties during the identification of gemstone. Specific gravity of Tanzanite is 3.20-3.50 whereas that of Zoisite is 3.20-3.50.