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Topaz
Topaz

Biotite
Biotite



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Topaz
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Biotite

Topaz and Biotite 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
-
-
2.7-3.3
Uneven, Even
Perfect on the {001}
2.5-3.0
K(Mg,Fe++)3[AlSi3O10(OH,F)2

Topaz and Biotite Chemical Formula

While comparing Topaz and Biotite 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 Biotite chemical formula.

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Topaz and Biotite Specific Gravity

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