Covellite and Alunite Physical Properties
Tenacity
Flexible
Brittle
Solubility
Not Available
Soluble
Durability
Not Available
Not Available
Specific Gravity
4.6-4.76
2.6-2.9
Fracture
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Metallic
Conchoidal, Uneven
Cleavage
Perfect on {0001}
On {0001}, perfect
Mohs Hardness
Not Available
3.5-4
Chemical Composition
CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
KAl3(SO4)2(OH)6
Covellite and Alunite Chemical Formula
While comparing Covellite and Alunite 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 Alunite chemical formula.
- Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
Covellite and Alunite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Covellite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Covellite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Covellite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.