Cuprite and Onyx Physical Properties

Cuprite

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

5.85-6.152.55-2.70

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Fair in four directions forming octahedrons

Indiscernible

1.7 Mohs Hardness

3.5-46.5-7

2 10

1.8 Chemical Composition

Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

SiO₂

Cuprite and Onyx Chemical Formula

While comparing Cuprite 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 Cuprite and Onyx chemical formula.

Chemical formula of Cuprite- Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Onyx- SiO₂

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Cuprite and Onyx Specific Gravity

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