Lapis lazuli and Kyanite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.50-3.00
3.53-3.65
Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Splintery, Brittle, Metallic
Cleavage
3,6
[100] perfect [010] imperfect with 79° angle between
Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Not Available
Lapis lazuli and Kyanite Chemical Formula
While comparing Lapis lazuli and Kyanite 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 Kyanite chemical formula.
- Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
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Lapis lazuli and Kyanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.