Blue John and Erythrite Physical Properties
Tenacity
Not Available
Sectile
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.00-3.25
3.06
Fracture
Not Available
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Cleavage
Not Available
Perfect on {010}; poor on {100} and { 1 02}.
Mohs Hardness
Not Available
Not Available
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Co3(AsO4)2•8(H2O)
Blue John and Erythrite Chemical Formula
While comparing Blue John and Erythrite 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 Erythrite chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Blue John and Erythrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Blue John is 3.06 whereas that of Erythrite is 3.06.