Topaz and Cordierite Physical Properties

Topaz

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.57

2.57-2.66

1.5 Fracture

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

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

[001] Perfect

Fair on {100}, poor on {001} and {010}

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Mg2Al4Si5O18

Topaz and Cordierite Chemical Formula

While comparing Topaz and Cordierite 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 Cordierite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Cordierite- Mg2Al4Si5O18

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Topaz and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.