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Onyx and Turquoise Physical Properties


Turquoise and Onyx Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Soluble   

Durability
Not Available   
Not Available   

Specific Gravity
2.55-2.70   
2.30-2.90   

Fracture
Not Available   
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle   

Cleavage
Indiscernible   
Good to perfect_usually N/A   

Mohs Hardness
6.5-7   
5-6   

Chemical Composition
SiO2   
CuAl6(PO4)4(OH)8 • 4H2O   

Optical Properties >>
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Onyx and Turquoise Chemical Formula

While comparing Onyx and Turquoise 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 Turquoise chemical formula.

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Onyx and Turquoise Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Turquoise Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Turquoise Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.30-2.90 whereas that of Turquoise is 2.30-2.90.

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