Opal and Cuprite Physical Properties
Tenacity
BrittleWalter Schumann
Brittle
Solubility
hot salt water
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
5.85-6.15
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Conchoidal, Metallic, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
None
Fair in four directions forming octahedrons
Mohs Hardness
5-6.5
3.5-4
Chemical Composition
SiO2 · nH2O
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Cuprite Chemical Formula
While comparing Opal and Cuprite 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 Cuprite chemical formula.
- Chemical formula of Opal- SiO2 · nH2O
- Chemical formula of Cuprite- Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Opal and Cuprite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Opal and Cuprite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Cuprite Optical Properties during the identification of gemstone. Specific gravity of Opal is 5.85-6.15 whereas that of Cuprite is 5.85-6.15.