Onyx and Covellite Physical Properties

Onyx

Covellite

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1 Physical Properties

1.1 Tenacity

Not Available

Flexible

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.704.6-4.76

1 7.18

1.5 Fracture

Not Available

Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic

1.6 Cleavage

Indiscernible

Perfect on {0001}

1.7 Mohs Hardness

6.5-7Not Available

2 10

1.8 Chemical Composition

SiO₂

CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references

Onyx and Covellite Chemical Formula

While comparing Onyx and Covellite 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 Onyx and Covellite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Onyx Vs Crystal Quartz

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Onyx and Covellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Covellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Covellite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 4.6-4.76 whereas that of Covellite is 4.6-4.76.