Blue John and Periclase Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.00-3.25
3.7-3.9
Fracture
Not Available
Conchoidal, Brittle
Cleavage
Not Available
{001} perfect; {111} imperfect, may exhibit parting on , {011}
Mohs Hardness
Not Available
5.5-6
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
Blue John and Periclase Chemical Formula
While comparing Blue John and Periclase 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 Periclase chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Periclase- MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
Blue John and Periclase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Periclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Periclase Optical Properties during the identification of gemstone. Specific gravity of Blue John is 3.7-3.9 whereas that of Periclase is 3.7-3.9.