Lawsonite and Neptunite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.09
  
3.19-3.23
  
Fracture
White, Yellow, Pale blue, Brittle, Uneven
  
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
  
Cleavage
Perfect on {100} and {010}, imperfect on {101}
  
{110} good
  
Mohs Hardness
8
  
5-6
  
Chemical Composition
Not Available
  
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Lawsonite and Neptunite Chemical Formula
While comparing Lawsonite and Neptunite 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 Lawsonite and Neptunite chemical formula.
>- Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
Lawsonite and Neptunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lawsonite and Neptunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lawsonite and Neptunite Optical Properties during the identification of gemstone. Specific gravity of Lawsonite is 3.19-3.23 whereas that of Neptunite is 3.19-3.23.