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Alunite
Alunite

Cryolite
Cryolite



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Alunite
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Cryolite

Alunite and Cryolite Physical Properties

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Physical Properties

Tenacity

Brittle
Brittle

Solubility

Soluble
Soluble

Durability

-
-

Specific Gravity

2.6-2.92.97
1 7.18
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Fracture

Conchoidal, Uneven
Uneven

Cleavage

On {0001}, perfect
None observed

Mohs Hardness

3.5-42.5
2 10
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Chemical Composition

KAl3(SO4)2(OH)6
Na 3AlF 6Ulrich Henn and Claudio C.

Alunite and Cryolite Chemical Formula

While comparing Alunite and Cryolite 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 Cryolite chemical formula.

  • Chemical formula of Alunite- KAl3(SO4)2(OH)6
  • Chemical formula of Cryolite- Na 3AlF 6Ulrich Henn and Claudio C.

Alunite and Cryolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Cryolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cryolite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.97 whereas that of Cryolite is 2.97.