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