Covellite and Achroite Physical Properties

Covellite and Achroite Chemical Formula

While comparing Covellite 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 Covellite and Achroite chemical formula.

• Chemical formula of Covellite- CuSMichael O’Donoghue , Gems, Sixth edition (2006) More from other references
• 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.

Covellite and Achroite Specific Gravity

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