Atacamite and Gahnite Physical Properties

Atacamite

Gahnite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.745-3.7764.00-4.62

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Brittle

Conchoidal, Uneven

1.6 Cleavage

Perfect on {010}, fair on {101}

Indistinct parting on [111]

1.7 Mohs Hardness

3-3.57.5-8

2 10

1.8 Chemical Composition

Cu2Cl(OH)3

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

Atacamite and Gahnite Chemical Formula

While comparing Atacamite 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 Atacamite and Gahnite chemical formula.

Chemical formula of Atacamite- Cu2Cl(OH)3
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Atacamite and Gahnite Specific Gravity

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