Topaz and Sillimanite Physical Properties

Topaz

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

3.49-3.573.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

[001] Perfect

{010} perfect

1.7 Mohs Hardness

86-7.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

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

Topaz and Sillimanite Chemical Formula

While comparing Topaz 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 Topaz and Sillimanite chemical formula.

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

Compare Gems for Sagittarius

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Topaz Vs Pietersite

Topaz Vs Quartz Smoky

Topaz and Sillimanite Specific Gravity

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