Corundum and Boulder Opal Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.90-4.05
1.98-2.25
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
None – parting in 3 directions
Not Available
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
SiO 2 + H 2OUlrich Henn and Claudio C.
Corundum and Boulder Opal Chemical Formula
While comparing Corundum and Boulder Opal 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 Corundum and Boulder Opal chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Corundum and Boulder Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Boulder Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Boulder Opal Optical Properties during the identification of gemstone. Specific gravity of Corundum is 1.98-2.25 whereas that of Boulder Opal is 1.98-2.25.