Zinnwaldite and Nepheline Physical Properties
Tenacity
Elastic
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.9-3.1
  
2.55-2.65
  
Fracture
Uneven
  
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
Perfect basal {001}
  
[1010] Poor
  
Mohs Hardness
3.5-4.0
  
5-6
  
Chemical Composition
Not Available
  
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
  
Zinnwaldite and Nepheline Chemical Formula
While comparing Zinnwaldite 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 Zinnwaldite and Nepheline chemical formula.
>- Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Zinnwaldite and Nepheline Specific Gravity
Another important criteria for qualitative analysis of gemstones is Zinnwaldite and Nepheline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zinnwaldite and Nepheline Optical Properties during the identification of gemstone. Specific gravity of Zinnwaldite is 2.55-2.65 whereas that of Nepheline is 2.55-2.65.