Riebeckite and Lazurite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.28-3.44
  
2.75
  
Fracture
Uneven, Splintery, Brittle
  
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
  
Cleavage
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
Imperfect on {110}
  
Mohs Hardness
5.0-6.0
  
5.5
  
Chemical Composition
Not Available
  
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
  
Riebeckite and Lazurite Chemical Formula
While comparing Riebeckite and Lazurite 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 Riebeckite and Lazurite chemical formula.
>- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Riebeckite and Lazurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Riebeckite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Riebeckite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Riebeckite is 2.75 whereas that of Lazurite is 2.75.