Black Opal and Calcite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
2.67-2.73
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Not Available
Perfect on [10 1 1] three directions with angle of 74° 55
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
CaCO 3Ulrich Henn and Claudio C.
Black Opal and Calcite Chemical Formula
While comparing Black Opal and Calcite 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 Calcite chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
Black Opal and Calcite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Calcite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.67-2.73 whereas that of Calcite is 2.67-2.73.