Onyx and Aragonite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Dilute acid
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
2.93-2.96
Fracture
Not Available
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
Indiscernible
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
6.5-7
3.5-4
Chemical Composition
SiO2
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Aragonite Chemical Formula
While comparing Onyx and Aragonite 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 Aragonite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Onyx and Aragonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.