Iolite and Sillimanite Physical Properties

Iolite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.73.20-3.26

1 7.18

1.5 Fracture

Not Available

Splintery

1.6 Cleavage

3,1

{010} perfect

1.7 Mohs Hardness

7-7.56-7.5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

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

Iolite and Sillimanite Chemical Formula

While comparing Iolite 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 Iolite and Sillimanite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Iolite and Sillimanite Specific Gravity

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