Topaz and Iolite Physical Properties

Topaz

Iolite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.572.6-2.7

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

[001] Perfect

3,1

1.7 Mohs Hardness

87-7.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Mg₂Al₄Si₅O₁₈

Topaz and Iolite Chemical Formula

While comparing Topaz and Iolite 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 Iolite chemical formula.

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

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Topaz and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Iolite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.6-2.7 whereas that of Iolite is 2.6-2.7.