Lazurite and Covellite Physical Properties
Tenacity
Brittle
Flexible
Solubility
Soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.75
4.6-4.76
Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Cleavage
Imperfect on {110}
Perfect on {0001}
Mohs Hardness
5.5
Not Available
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Lazurite and Covellite Chemical Formula
While comparing Lazurite and Covellite 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 Lazurite and Covellite chemical formula.
- Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
- Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Lazurite and Covellite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lazurite and Covellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lazurite and Covellite Optical Properties during the identification of gemstone. Specific gravity of Lazurite is 4.6-4.76 whereas that of Covellite is 4.6-4.76.