Iolite and Nepheline Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
2.55-2.65
  
Fracture
Not Available
  
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
3,1
  
[1010] Poor
  
Mohs Hardness
7-7.5
  
5-6
  
Chemical Composition
Mg2Al4Si5O18
  
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
  
Iolite and Nepheline Chemical Formula
While comparing Iolite and Nepheline 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 Nepheline chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
- Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Iolite and Nepheline Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Nepheline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Nepheline Optical Properties during the identification of gemstone. Specific gravity of Iolite is 2.55-2.65 whereas that of Nepheline is 2.55-2.65.