Corundum and Afghanite Physical Properties
Tenacity
Brittle
Not Available
Solubility
insoluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.90-4.05
2.55-2.65
Fracture
Uneven, Uneven, Gems, Difficult, Fibrous
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
None – parting in 3 directions
Perfect {10 1 0}
Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Corundum and Afghanite Chemical Formula
While comparing Corundum and Afghanite 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 Corundum and Afghanite chemical formula.
- Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Corundum and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Corundum and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.