Datolite and Iolite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.90-3.00
  
2.6-2.7
  
Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
  
Not Available
  
Cleavage
None
  
3,1
  
Mohs Hardness
5-5.5
  
7-7.5
  
Chemical Composition
CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
  
Mg2Al4Si5O18
  
Datolite and Iolite Chemical Formula
While comparing Datolite and Iolite 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 Datolite and Iolite chemical formula.
- Chemical formula of Datolite- CaBSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Iolite- Mg2Al4Si5O18
Datolite and Iolite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Datolite and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Datolite and Iolite Optical Properties during the identification of gemstone. Specific gravity of Datolite is 2.6-2.7 whereas that of Iolite is 2.6-2.7.