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Lapis lazuli and Tanzanite Physical Properties


Tanzanite and Lapis lazuli Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Hard   

Specific Gravity
2.50-3.00   
3.35   

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

Cleavage
3,6   
Perfect {010}, imperfect {100}   

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   
Ca2Al3(SiO4)3(OH)   

Optical Properties >>
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Lapis lazuli and Tanzanite Chemical Formula

While comparing Lapis lazuli and Tanzanite 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 Tanzanite chemical formula.

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Lapis lazuli and Tanzanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Tanzanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Tanzanite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 3.35 whereas that of Tanzanite is 3.35.

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