Black Opal and Realgar Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
3.56
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
(e.g. graphite).
Cleavage
Not Available
{010} Good
Mohs Hardness
6-6.5
Not Available
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
AsSMichael OâDonoghue , Gems, Sixth Edition (2006)
Black Opal and Realgar Chemical Formula
While comparing Black Opal and Realgar 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 Realgar chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Realgar- AsSMichael OâDonoghue , Gems, Sixth Edition (2006)
Black Opal and Realgar Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Realgar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Realgar Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 3.56 whereas that of Realgar is 3.56.