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