Covellite and Lapis lazuli Physical Properties
Tenacity
Flexible
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.6-4.76
2.50-3.00
Fracture
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
Cleavage
Perfect on {0001}
3,6
Mohs Hardness
Not Available
5.5
Chemical Composition
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Covellite and Lapis lazuli Chemical Formula
While comparing Covellite 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 Covellite and Lapis lazuli chemical formula.
- Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4
Covellite and Lapis lazuli Specific Gravity
Another important criteria for qualitative analysis of gemstones is Covellite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Covellite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Covellite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.