Ludlamite and Blue John Physical Properties

Ludlamite and Blue John Chemical Formula

While comparing Ludlamite 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 Ludlamite and Blue John chemical formula.

• Chemical formula of Ludlamite- (Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Ludlamite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ludlamite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ludlamite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Ludlamite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.