Phenakite and Blue John Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.90-2.98
3.00-3.25
Fracture
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
Not Available
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
Not Available
Mohs Hardness
7.5-8
Not Available
Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Phenakite and Blue John Chemical Formula
While comparing Phenakite and Blue John 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 Phenakite and Blue John chemical formula.
- Chemical formula of Phenakite- Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Phenakite and Blue John Specific Gravity
Another important criteria for qualitative analysis of gemstones is Phenakite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Phenakite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Phenakite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.