Alunite and Gahnite Physical Properties

Alunite and Gahnite Chemical Formula

While comparing Alunite and Gahnite 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 Gahnite chemical formula.

• Chemical formula of Alunite- KAl3(SO4)2(OH)6
• Chemical formula of Gahnite- ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)

Alunite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.