Opal and Nepheline Physical Properties
Tenacity
BrittleWalter Schumann
  
Not Available
  
Solubility
hot salt water
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.98-2.25
  
2.55-2.65
  
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
  
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
None
  
[1010] Poor
  
Mohs Hardness
5-6.5
  
5-6
  
Chemical Composition
SiO2 · nH2O
  
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
  
Opal and Nepheline Chemical Formula
While comparing Opal 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 Opal and Nepheline chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Opal and Nepheline Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Nepheline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Nepheline Optical Properties during the identification of gemstone. Specific gravity of Opal is 2.55-2.65 whereas that of Nepheline is 2.55-2.65.