Cordierite and Starlite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.57-2.66
3.91-4.73
Fracture
Subconchoidal, Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
Fair on {100}, poor on {001} and {010}
Not Available
Mohs Hardness
7-7.5
6.5-7.5
Chemical Composition
Mg2Al4Si5O18
ZrSiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Cordierite and Starlite Chemical Formula
While comparing Cordierite and Starlite 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 Starlite chemical formula.
- Chemical formula of Cordierite- Mg2Al4Si5O18
- Chemical formula of Starlite- ZrSiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Cordierite and Starlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite and Starlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Starlite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.91-4.73 whereas that of Starlite is 3.91-4.73.