Sapphire and Iolite Physical Properties

Sapphire

Iolite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.032.6-2.7

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Not Available

1.6 Cleavage

None, but may exhibit parting

3,1

1.7 Mohs Hardness

97-7.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

Mg₂Al₄Si₅O₁₈

Sapphire and Iolite Chemical Formula

While comparing Sapphire and Iolite 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 Iolite chemical formula.

Chemical formula of Sapphire- Al ₂ O ₃
Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈

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Sapphire and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sapphire and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Iolite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 2.6-2.7 whereas that of Iolite is 2.6-2.7.