Polyhalite and Alunite Physical Properties

Polyhalite and Alunite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Alunite chemical formula.

• Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O
• Chemical formula of Alunite- KAl3(SO4)2(OH)6

Polyhalite and Alunite Specific Gravity

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