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