Covellite and Biotite Physical Properties
Tenacity
Flexible
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
4.6-4.76
  
2.7-3.3
  
Fracture
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
  
Uneven, Even, Yellow, White
  
Cleavage
Perfect on {0001}
  
Perfect on the {001}
  
Mohs Hardness
Not Available
  
2.5-3.0
  
Chemical Composition
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
  
K(Mg,Fe++)3[AlSi3O10(OH,F)2
  
Covellite and Biotite Chemical Formula
While comparing Covellite and Biotite 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 Covellite and Biotite chemical formula.
- Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Covellite and Biotite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Covellite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Covellite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Covellite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.