Black Opal and Aragonite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Dilute acid
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
2.93-2.96
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
Not Available
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
6-6.5
3.5-4
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Black Opal and Aragonite Chemical Formula
While comparing Black Opal 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 Black Opal and Aragonite chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Black Opal and Aragonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.