Topaz and Gahnite Physical Properties

Topaz

Gahnite

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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

3.49-3.574.00-4.62

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

[001] Perfect

Indistinct parting on [111]

1.7 Mohs Hardness

87.5-8

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Topaz and Gahnite Chemical Formula

While comparing Topaz and Gahnite 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 Gahnite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Topaz and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.