Sapphire and Sillimanite Physical Properties

Sapphire

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.033.20-3.26

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Splintery

1.6 Cleavage

None, but may exhibit parting

{010} perfect

1.7 Mohs Hardness

96-7.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

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

Sapphire and Sillimanite Chemical Formula

While comparing Sapphire and Sillimanite 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 Sapphire and Sillimanite chemical formula.

Chemical formula of Sapphire- Al ₂ O ₃
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sapphire and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sapphire and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.