Corundum and Iolite Physical Properties

Corundum

Iolite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.6-2.7

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Not Available

1.6 Cleavage

None – parting in 3 directions

3,1

1.7 Mohs Hardness

97-7.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

Mg₂Al₄Si₅O₁₈

Corundum and Iolite Chemical Formula

While comparing Corundum 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 Corundum and Iolite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈

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Corundum and Iolite Specific Gravity

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