Sillimanite and Zircon Physical Properties

Sillimanite

Zircon

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.263.93-4.73

1 7.18

1.5 Fracture

Splintery

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{010} perfect

{110} and {111}

1.7 Mohs Hardness

6-7.57.5

2 10

1.8 Chemical Composition

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

ZrSiO₄

Sillimanite and Zircon Chemical Formula

While comparing Sillimanite and Zircon 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 Zircon chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Zircon- ZrSiO₄

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Sillimanite and Zircon Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Zircon Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Zircon Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.93-4.73 whereas that of Zircon is 3.93-4.73.