Black Opal and Prehnite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
2.80-2.95
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Cleavage
Not Available
Distinct on [001]
Mohs Hardness
6-6.5
6-6.5
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Ca2Al2Si3O12(OH)
Black Opal and Prehnite Chemical Formula
While comparing Black Opal and Prehnite 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 Prehnite chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Prehnite- Ca2Al2Si3O12(OH)
Black Opal and Prehnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.