Lapis lazuli and Gahnite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.50-3.00
4.00-4.62
Fracture
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Conchoidal, Uneven
Cleavage
3,6
Indistinct parting on [111]
Chemical Composition
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Lapis lazuli and Gahnite Chemical Formula
While comparing Lapis lazuli and Gahnite 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 Gahnite 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
- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Lapis lazuli and Gahnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.