Blue John and Lazurite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
3.00-3.25
2.75
Fracture
Not Available
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
Not Available
Imperfect on {110}
Mohs Hardness
Not Available
5.5
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Blue John and Lazurite Chemical Formula
While comparing Blue John 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 Blue John and Lazurite chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Blue John and Lazurite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Blue John is 2.75 whereas that of Lazurite is 2.75.