Aragonite and Atacamite Physical Properties

Aragonite

Atacamite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Dilute acid

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.93-2.963.745-3.776

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Conchoidal, Conchoidal, Brittle

1.6 Cleavage

Distinct on {010}, imperfect {110} and {011}

Perfect on {010}, fair on {101}

1.7 Mohs Hardness

3.5-43-3.5

2 10

1.8 Chemical Composition

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Cu2Cl(OH)3

Aragonite and Atacamite Chemical Formula

While comparing Aragonite and Atacamite 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 Aragonite and Atacamite chemical formula.

Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Atacamite- Cu2Cl(OH)3

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Aragonite and Atacamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Aragonite and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Aragonite and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Aragonite is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.