Opal and Covellite Physical Properties
Tenacity
BrittleWalter Schumann
Flexible
Solubility
hot salt water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
4.6-4.76
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Cleavage
None
Perfect on {0001}
Mohs Hardness
5-6.5
Not Available
Chemical Composition
SiO2 · nH2O
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Opal and Covellite Chemical Formula
While comparing Opal 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 Opal and Covellite chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Opal and Covellite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Covellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Covellite Optical Properties during the identification of gemstone. Specific gravity of Opal is 4.6-4.76 whereas that of Covellite is 4.6-4.76.