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Cordierite and Lapis lazuli Physical Properties


Lapis lazuli and Cordierite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.57-2.66   
2.50-3.00   

Fracture
Subconchoidal, Conchoidal, Brittle   
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)   

Cleavage
Fair on {100}, poor on {001} and {010}   
3,6   

Mohs Hardness
7-7.5   
5.5   

Chemical Composition
Mg2Al4Si5O18   
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4   

Optical Properties >>
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Cordierite and Lapis lazuli Chemical Formula

While comparing Cordierite and Lapis lazuli 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 Cordierite and Lapis lazuli chemical formula.

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Cordierite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.

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