Blue John and Goethite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
HCl soluble
Durability
Not Available
Not Available
Specific Gravity
3.00-3.25
4.27-4.29
Fracture
Not Available
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Cleavage
Not Available
Perfect {010}
Mohs Hardness
Not Available
5-5.5
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
FeO(OH)Arthur Thomas , Gemstones (2009)
Blue John and Goethite Chemical Formula
While comparing Blue John and Goethite 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 Goethite chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Blue John and Goethite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Goethite Optical Properties during the identification of gemstone. Specific gravity of Blue John is 4.27-4.29 whereas that of Goethite is 4.27-4.29.