Anorthite and Alunite Physical Properties

Anorthite and Alunite Chemical Formula

While comparing Anorthite 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 Anorthite and Alunite chemical formula.

• Chemical formula of Anorthite- CaAl 2Si 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Alunite- KAl3(SO4)2(OH)6

Anorthite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anorthite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anorthite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Anorthite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.