Sillimanite and Topaz Physical Properties

Sillimanite

Topaz

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.26

3.49-3.57

1.5 Fracture

Splintery

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

{010} perfect

[001] Perfect

1.7 Mohs Hardness

6-7.5

1.8 Chemical Composition

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

Al₂SiO₄(F,OH)₂

Sillimanite and Topaz Chemical Formula

While comparing Sillimanite and Topaz 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 Topaz chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Sillimanite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.