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Gahnite
Gahnite

Lapis lazuli
Lapis lazuli



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Gahnite
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Lapis lazuli

Gahnite and Lapis lazuli Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
4.00-4.622.50-3.00
Amber
1 7.18
1.5 Fracture
Conchoidal, Uneven
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
1.6 Cleavage
Indistinct parting on [111]
3,6
1.7 Mohs Hardness
7.5-85.5
Amber
2 10
1.8 Chemical Composition
ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4

Gahnite and Lapis lazuli Chemical Formula

While comparing Gahnite and Lapis lazuli 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 Gahnite and Lapis lazuli chemical formula.

  • Chemical formula of Gahnite- ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4

Gahnite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.