Erythrite and Afghanite Physical Properties
Tenacity
Sectile
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.06
2.55-2.65
Fracture
Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
Perfect on {010}; poor on {100} and { 1 02}.
Perfect {10 1 0}
Mohs Hardness
Not Available
5.5-6
Chemical Composition
Co3(AsO4)2•8(H2O)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Erythrite and Afghanite Chemical Formula
While comparing Erythrite 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 Erythrite and Afghanite chemical formula.
- Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Erythrite and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Erythrite and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.