Cordierite and Oligoclase Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.57-2.66
2.62-2.67
Fracture
Subconchoidal, Conchoidal, Brittle
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven
Cleavage
Fair on {100}, poor on {001} and {010}
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
7-7.5
6-6.5
Chemical Composition
Mg2Al4Si5O18
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Cordierite and Oligoclase Chemical Formula
While comparing Cordierite and Oligoclase 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 Cordierite and Oligoclase chemical formula.
- Chemical formula of Cordierite- Mg2Al4Si5O18
- Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Cordierite and Oligoclase Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.