Onyx and Afghanite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.55-2.70
2.55-2.65
Fracture
Not Available
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
Indiscernible
Perfect {10 1 0}
Mohs Hardness
6.5-7
5.5-6
Chemical Composition
SiO2
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Onyx and Afghanite Chemical Formula
While comparing Onyx 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 Onyx and Afghanite chemical formula.
- Chemical formula of Onyx- SiO2
- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Onyx and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Onyx and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.