Sillimanite and Fayalite Physical Properties

Sillimanite

Fayalite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.264.392

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

{010} moderate, {100} imperfect

1.7 Mohs Hardness

6-7.56.5-7

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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

Sillimanite and Fayalite Chemical Formula

While comparing Sillimanite and Fayalite 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 Sillimanite and Fayalite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sillimanite and Fayalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Fayalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Fayalite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 4.392 whereas that of Fayalite is 4.392.