Kyanite and Afghanite Physical Properties
Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.53-3.65
2.55-2.65
Fracture
Splintery, Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
[100] perfect [010] imperfect with 79° angle between
Perfect {10 1 0}
Mohs Hardness
4-7
5.5-6
Chemical Composition
Not Available
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Kyanite and Afghanite Chemical Formula
While comparing Kyanite 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 Kyanite and Afghanite chemical formula.
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- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Kyanite and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.
