Alunite and Annabergite Physical Properties

Alunite

Annabergite

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1 Physical Properties

1.1 Tenacity

Brittle

Sectile

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.07

1 7.18

1.5 Fracture

Conchoidal, Uneven

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

On {0001}, perfect

Perfect on {010}, indistinct on {100} and {102}

1.7 Mohs Hardness

3.5-42

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Ni3(AsO4)2•8(H2O)

Alunite and Annabergite Chemical Formula

While comparing Alunite and Annabergite 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 Annabergite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)

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Alunite and Annabergite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Annabergite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Annabergite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.07 whereas that of Annabergite is 3.07.