Azurite and Onyx Physical Properties

Azurite

Onyx

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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

3.70-3.90

2.55-2.70

1.5 Fracture

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

Not Available

1.6 Cleavage

Perfect on {011}, fair on {100}, poor on {110}

Indiscernible

1.7 Mohs Hardness

3.5-4

6.5-7

1.8 Chemical Composition

Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

SiO₂

Azurite and Onyx Chemical Formula

While comparing Azurite and Onyx 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 Azurite and Onyx chemical formula.

Chemical formula of Azurite- Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Onyx- SiO₂

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Azurite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Azurite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Azurite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Azurite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.