Atacamite and Afghanite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.745-3.776
2.55-2.65
Fracture
Conchoidal, Conchoidal, Brittle
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
Cleavage
Perfect on {010}, fair on {101}
Perfect {10 1 0}
Mohs Hardness
3-3.5
5.5-6
Chemical Composition
Cu2Cl(OH)3
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Atacamite and Afghanite Chemical Formula
While comparing Atacamite 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 Atacamite and Afghanite chemical formula.
- Chemical formula of Atacamite- Cu2Cl(OH)3
- Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Atacamite and Afghanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Atacamite and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Atacamite and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Atacamite is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.