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Lapis lazuli
Lapis lazuli

Sard
Sard



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Lapis lazuli
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Sard

Lapis lazuli and Sard Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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-
-
2.50-3.00
Uneven-Conchoidal, ConchoidalWalter Schumann
3,6
5.5
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
 
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-
-
2.58-2.63
Conchoidal
None
6.5-7
SiO 2Ulrich Henn and Claudio C.

Lapis lazuli and Sard Chemical Formula

While comparing Lapis lazuli and Sard 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 Sard chemical formula.

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Lapis lazuli and Sard Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli Vs Sard during the identification of gemstone. Specific gravity of Lapis lazuli is whereas that of Sard is .