Londonite and Blue John Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.34
3.00-3.25
Fracture
ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Not Available
Cleavage
None
Not Available
Mohs Hardness
Not Available
Not Available
Chemical Composition
(Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Londonite and Blue John Chemical Formula
While comparing Londonite 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 Londonite and Blue John chemical formula.
- Chemical formula of Londonite- (Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Londonite and Blue John Specific Gravity
Another important criteria for qualitative analysis of gemstones is Londonite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Londonite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Londonite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.