Alunite and Andalusite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Soluble
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.6-2.9
3.05-3.21
Fracture
Conchoidal, Uneven
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)
Cleavage
On {0001}, perfect
Good on {110}, poor on {100}
Chemical Composition
KAl3(SO4)2(OH)6
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Alunite and Andalusite Chemical Formula
While comparing Alunite and Andalusite 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 Andalusite chemical formula.
- Chemical formula of Alunite- KAl3(SO4)2(OH)6
- Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Alunite and Andalusite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Alunite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.