Zircon and Sillimanite Physical Properties

Zircon

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.93-4.733.20-3.26

1 7.18

2.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Splintery

2.6 Cleavage

{110} and {111}

{010} perfect

2.7 Mohs Hardness

7.56-7.5

2 10

2.11 Chemical Composition

ZrSiO₄

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

Zircon and Sillimanite Chemical Formula

While comparing Zircon 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 Zircon and Sillimanite chemical formula.

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

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Zircon and Sillimanite Specific Gravity

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