Staurolite and Blue John Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.7-3.8
3.00-3.25
Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Not Available
Cleavage
Distinct on {010}
Not Available
Mohs Hardness
7-7.5
Not Available
Chemical Composition
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Staurolite and Blue John Chemical Formula
While comparing Staurolite 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 Staurolite and Blue John chemical formula.
- Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Staurolite and Blue John Specific Gravity
Another important criteria for qualitative analysis of gemstones is Staurolite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.