Oligoclase and Black Opal Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.62-2.67
1.97-2.22
Fracture
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
From the Greek, oligos and kasein, little cleavage.
Not Available
Mohs Hardness
6-6.5
6-6.5
Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 + H 2OUlrich Henn and Claudio C.
Oligoclase and Black Opal Chemical Formula
While comparing Oligoclase 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 Oligoclase and Black Opal chemical formula.
- Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Oligoclase and Black Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Oligoclase and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Oligoclase and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Oligoclase is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.