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