Lazurite and Obsidian Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.75
  
2.35-2.60
  
Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Conchoidal, ConchoidalWalter Schumann, Conchoidal
  
Cleavage
Imperfect on {110}
  
Not Available
  
Mohs Hardness
5.5
  
5-5.5
  
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
  
Not Available
  
Lazurite and Obsidian Chemical Formula
While comparing Lazurite and Obsidian 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 Lazurite and Obsidian chemical formula.
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
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Lazurite and Obsidian Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lazurite and Obsidian Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lazurite and Obsidian Optical Properties during the identification of gemstone. Specific gravity of Lazurite is 2.35-2.60 whereas that of Obsidian is 2.35-2.60.