Onyx and Cuprite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
5.85-6.15
Fracture
Not Available
Conchoidal, Metallic, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Indiscernible
Fair in four directions forming octahedrons
Mohs Hardness
6.5-7
3.5-4
Chemical Composition
SiO2
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Cuprite Chemical Formula
While comparing Onyx 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 Onyx and Cuprite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Cuprite- Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Cuprite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Cuprite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Cuprite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 5.85-6.15 whereas that of Cuprite is 5.85-6.15.