Ruby and Lapis lazuli Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.97-4.05
  
2.50-3.00
  
Fracture
Conchoidal
  
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
No true cleavage
  
3,6
  
Mohs Hardness
9
  
5.5
  
Chemical Composition
Al 2 O 3
  
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
  
Ruby and Lapis lazuli Chemical Formula
While comparing Ruby and Lapis lazuli 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 Ruby and Lapis lazuli chemical formula.
- Chemical formula of Ruby- Al 2 O 3
- Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Ruby and Lapis lazuli Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ruby and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Ruby is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.
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