Diaspore and Iolite Physical Properties
Tenacity
Very brittle
  
Not Available
  
Solubility
insoluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.30-3.40
  
2.6-2.7
  
Fracture
Conchoidal, Brittle, Conchoidal
  
Not Available
  
Cleavage
{010} perfect, {110} distinct, {100} in traces
  
3,1
  
Mohs Hardness
6.5-7
  
7-7.5
  
Chemical Composition
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
  
Mg2Al4Si5O18
  
Diaspore and Iolite Chemical Formula
While comparing Diaspore 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 Diaspore and Iolite chemical formula.
- Chemical formula of Diaspore- AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
- Chemical formula of Iolite- Mg2Al4Si5O18
Diaspore and Iolite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Diaspore and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Diaspore and Iolite Optical Properties during the identification of gemstone. Specific gravity of Diaspore is 2.6-2.7 whereas that of Iolite is 2.6-2.7.