Annabergite and Gahnite Physical Properties

Annabergite

Gahnite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.074.00-4.62

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}

Indistinct parting on [111]

1.7 Mohs Hardness

27.5-8

2 10

1.8 Chemical Composition

Ni3(AsO4)2•8(H2O)

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Annabergite and Gahnite Chemical Formula

While comparing Annabergite and Gahnite 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 Gahnite chemical formula.

Chemical formula of Annabergite- Ni3(AsO4)2•8(H2O)
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Annabergite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Annabergite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Annabergite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Annabergite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.