Dravite and Bertrandite Physical Properties

Dravite and Bertrandite Chemical Formula

While comparing Dravite and Bertrandite 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 Dravite and Bertrandite chemical formula.

• Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
• Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Dravite and Bertrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.