Alunite and Sodalite Physical Properties

Alunite

Sodalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.92.15-2.40

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

1.6 Cleavage

On {0001}, perfect

Poor on {110}

1.7 Mohs Hardness

3.5-45-6

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Na₈Al₆Si₆O₂₄Cl₂

Alunite and Sodalite Chemical Formula

While comparing Alunite and Sodalite 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 Sodalite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂

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Alunite and Sodalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.