Polyhalite and Allanite Physical Properties

Polyhalite and Allanite Chemical Formula

While comparing Polyhalite and Allanite 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 Allanite chemical formula.

• Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O
• Chemical formula of Allanite- Ca(Ce,La,Y,Ca)Al2(Fe,Al)Si3O12(OH)

Polyhalite and Allanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Allanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Allanite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.40-4.20 whereas that of Allanite is 3.40-4.20.