Black Opal and Pyromorphite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
6.5-7.1
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, ConchoidalArthur Thomas, Brittle, Metallic
Cleavage
Not Available
Imperfect- [10 1 1]
Mohs Hardness
6-6.5
3.5-4
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)
Black Opal and Pyromorphite Chemical Formula
While comparing Black Opal and Pyromorphite 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 Pyromorphite chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Pyromorphite- Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)
Black Opal and Pyromorphite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Pyromorphite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Pyromorphite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 6.5-7.1 whereas that of Pyromorphite is 6.5-7.1.