Fayalite and Blue John Physical Properties

Fayalite

Blue John

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.3923.00-3.25

1 7.18

1.5 Fracture

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Not Available

1.6 Cleavage

{010} moderate, {100} imperfect

Not Available

1.7 Mohs Hardness

6.5-7Not Available

2 10

1.8 Chemical Composition

Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Fayalite and Blue John Chemical Formula

While comparing Fayalite 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 Fayalite and Blue John chemical formula.

Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Fayalite Vs Hackmanite

Fayalite and Blue John Specific Gravity

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