Peridot and Afghanite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.54-1.55
2.55-2.65
Fracture
Conchoidal
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
Poor
Perfect {10 1 0}
Mohs Hardness
6.5-7
5.5-6
Chemical Composition
(Mg,Fe)2SiO4
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Peridot and Afghanite Chemical Formula
While comparing Peridot 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 Peridot and Afghanite chemical formula.
- Chemical formula of Peridot- (Mg,Fe)2SiO4
- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Peridot and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Peridot and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Peridot and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Peridot is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.