Spinel and Atacamite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
none
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.64-3.66
  
3.745-3.776
  
Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Conchoidal, Conchoidal, Brittle
  
Cleavage
None, but may exhibit slight parting
  
Perfect on {010}, fair on {101}
  
Mohs Hardness
8
  
3-3.5
  
Chemical Composition
MgAl2O4
  
Cu2Cl(OH)3
  
Spinel and Atacamite Chemical Formula
While comparing Spinel and Atacamite 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 Spinel and Atacamite chemical formula.
- Chemical formula of Spinel- MgAl2O4
- Chemical formula of Atacamite- Cu2Cl(OH)3
Spinel and Atacamite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Spinel and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Spinel is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.