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