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Lapis lazuli
Lapis lazuli

Williamsite
Williamsite



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Lapis lazuli
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Williamsite

Lapis lazuli and Williamsite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
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
 
-
-
-
2.51-2.63
Conchoidal
Perfect
4
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)

Lapis lazuli and Williamsite Chemical Formula

While comparing Lapis lazuli and Williamsite 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 Williamsite chemical formula.

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Lapis lazuli and Williamsite Specific Gravity

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