Alunite and Marialite Physical Properties

Alunite

Marialite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.92.50

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal

1.6 Cleavage

On {0001}, perfect

Distinct on {100} and {110}

1.7 Mohs Hardness

3.5-45.5-6

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

Alunite and Marialite Chemical Formula

While comparing Alunite and Marialite 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 Marialite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Marialite- 3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)

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Alunite and Marialite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Marialite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Marialite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.50 whereas that of Marialite is 2.50.