Topaz and Sodalite Physical Properties

Topaz

Sodalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.57

2.15-2.40

1.5 Fracture

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

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

1.6 Cleavage

[001] Perfect

Poor on {110}

1.7 Mohs Hardness

5-6

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Na₈Al₆Si₆O₂₄Cl₂

Topaz and Sodalite Chemical Formula

While comparing Topaz and Sodalite 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 Sodalite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂

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Topaz and Sodalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.