Atacamite and Ettringite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Partially soluble in water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.745-3.776
  
1.77
  
Fracture
Conchoidal, Conchoidal, Brittle
  
Not Available
  
Cleavage
Perfect on {010}, fair on {101}
  
Perfect on {10 1 0}
  
Mohs Hardness
3-3.5
  
2-2.5
  
Chemical Composition
Cu2Cl(OH)3
  
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
Atacamite and Ettringite Chemical Formula
While comparing Atacamite and Ettringite 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 Ettringite chemical formula.
- Chemical formula of Atacamite- Cu2Cl(OH)3
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Atacamite and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Atacamite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Atacamite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Atacamite is 1.77 whereas that of Ettringite is 1.77.