Adamite and Alunite Physical Properties

Adamite

Alunite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.32-4.48

2.6-2.9

1.5 Fracture

Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic

Conchoidal, Uneven

1.6 Cleavage

{101}, good; {010}, poor

On {0001}, perfect

1.7 Mohs Hardness

3.5

3.5-4

1.8 Chemical Composition

Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)

KAl3(SO4)2(OH)6

Adamite and Alunite Chemical Formula

While comparing Adamite 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 Adamite and Alunite chemical formula.

Chemical formula of Adamite- Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Adamite and Alunite Specific Gravity

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