Alunite and Anhydrite Physical Properties
Solubility
Soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.6-2.9
2.90-2.98
Fracture
Conchoidal, Uneven
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
On {0001}, perfect
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Chemical Composition
KAl3(SO4)2(OH)6
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Alunite and Anhydrite Chemical Formula
While comparing Alunite and Anhydrite 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 Anhydrite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Alunite and Anhydrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.