Alunite and Achroite Physical Properties

Alunite and Achroite Chemical Formula

While comparing Alunite and Achroite 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 Achroite chemical formula.

• Chemical formula of Alunite- KAl3(SO4)2(OH)6
• Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Alunite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.