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Alunite
Alunite

Biotite
Biotite



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Alunite
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Biotite

Alunite and Biotite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
Soluble
-
2.6-2.9
Conchoidal, Uneven
On {0001}, perfect
3.5-4
KAl3(SO4)2(OH)6
 
Brittle
-
-
2.7-3.3
Uneven, Even
Perfect on the {001}
2.5-3.0
K(Mg,Fe++)3[AlSi3O10(OH,F)2

Alunite and Biotite Chemical Formula

While comparing Alunite 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 Alunite and Biotite chemical formula.

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Alunite and Biotite Specific Gravity

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