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Albite
Albite

Alunite
Alunite



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Albite
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Alunite

Albite and Alunite Physical Properties

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Physical Properties

Tenacity

Brittle
Brittle

Solubility

-
Soluble

Durability

-
-

Specific Gravity

2.60-2.652.6-2.9
1 7.18
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Fracture

Uneven, Conchoidal
Conchoidal, Uneven

Cleavage

Perfect on {001}, very good on {010}, imperfect on {110}
On {0001}, perfect

Mohs Hardness

6-6.53.5-4
2 10
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Chemical Composition

NaAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
KAl3(SO4)2(OH)6

Albite and Alunite Chemical Formula

While comparing Albite and Alunite 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 Albite and Alunite chemical formula.

  • Chemical formula of Albite- NaAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Alunite- KAl3(SO4)2(OH)6

Albite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Albite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Albite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Albite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.