Alunite and Aragonite Physical Properties
Solubility
Soluble
Dilute acid
Durability
Not Available
Not Available
Specific Gravity
2.6-2.9
2.93-2.96
Fracture
Conchoidal, Uneven
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
On {0001}, perfect
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
3.5-4
3.5-4
Chemical Composition
KAl3(SO4)2(OH)6
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Alunite and Aragonite Chemical Formula
While comparing Alunite and Aragonite 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 Alunite and Aragonite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Alunite and Aragonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.