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Alunite
Alunite

Nepheline
Nepheline



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Alunite
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Nepheline

Alunite and Nepheline 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
 
-
-
-
2.55-2.65
Subconchoidal, Conchoidal
[1010] Poor
5-6
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.

Alunite and Nepheline Chemical Formula

While comparing Alunite and Nepheline 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 Nepheline chemical formula.

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Alunite and Nepheline Specific Gravity

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