Boulder Opal and Chalcedony Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
1.98-2.25
2.55-2.70
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann
Cleavage
Not Available
Absent
Mohs Hardness
5-6.5
6.5-7
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
SiO2
Boulder Opal and Chalcedony Chemical Formula
While comparing Boulder Opal and Chalcedony 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 Boulder Opal and Chalcedony chemical formula.
- Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Chalcedony- SiO2
Boulder Opal and Chalcedony Specific Gravity
Another important criteria for qualitative analysis of gemstones is Boulder Opal and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.