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Lapis lazuli and Onyx Physical Properties


Onyx and Lapis lazuli Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.50-3.00   
2.55-2.70   

Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)   
Not Available   

Cleavage
3,6   
Indiscernible   

Mohs Hardness
5.5   
6.5-7   

Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4   
SiO2   

Optical Properties >>
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Lapis lazuli and Onyx Chemical Formula

While comparing Lapis lazuli 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 Lapis lazuli and Onyx chemical formula.

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Lapis lazuli and Onyx Specific Gravity

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

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