Iolite and Lazurite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
2.75
  
Fracture
Not Available
  
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
3,1
  
Imperfect on {110}
  
Mohs Hardness
7-7.5
  
5.5
  
Chemical Composition
Mg2Al4Si5O18
  
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
  
Iolite and Lazurite Chemical Formula
While comparing Iolite and Lazurite 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 Iolite and Lazurite chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Iolite and Lazurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 2.75 whereas that of Lazurite is 2.75.