Annabergite and Alunite Physical Properties

Annabergite

Alunite

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1 Physical Properties

1.1 Tenacity

Sectile

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.072.6-2.9

1 7.18

1.5 Fracture

Brittle, Metallic, Brittle, Metallic, Brittle, Metallic

Conchoidal, Uneven

1.6 Cleavage

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

On {0001}, perfect

1.7 Mohs Hardness

23.5-4

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

KAl3(SO4)2(OH)6

Annabergite and Alunite Chemical Formula

While comparing Annabergite 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 Annabergite and Alunite chemical formula.

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

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Annabergite and Alunite Specific Gravity

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