Afghanite and Sellaite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.55-2.65
  
3.14-3.16
  
Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle
  
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
  
Cleavage
Perfect {10 1 0}
  
Perfect on {010} and {110}
  
Mohs Hardness
5.5-6
  
5-5.5
  
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
  
MgF 2Ulrich Henn and Claudio C.
  
Afghanite and Sellaite Chemical Formula
While comparing Afghanite and Sellaite 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 Sellaite 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 Sellaite- MgF 2Ulrich Henn and Claudio C.
Afghanite and Sellaite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Afghanite and Sellaite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Sellaite Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 3.14-3.16 whereas that of Sellaite is 3.14-3.16.