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Topaz
Topaz

Neptunite
Neptunite



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Topaz
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Neptunite

Topaz and Neptunite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.49-3.57
Subconchoidal, Uneven, Conchoidal
[001] Perfect
8
Al2SiO4(F,OH)2
 
Brittle
-
-
3.19-3.23
Conchoidal
{110} good
5-6
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael O’Donoghue , Gems, Sixth Edition (2006)

Topaz and Neptunite Chemical Formula

While comparing Topaz and Neptunite 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 Neptunite chemical formula.

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Topaz and Neptunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Neptunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz Vs Neptunite during the identification of gemstone. Specific gravity of Topaz is whereas that of Neptunite is .