Sillimanite and Neptunite Physical Properties

Sillimanite and Neptunite Chemical Formula

While comparing Sillimanite and Neptunite 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 Sillimanite and Neptunite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael O’Donoghue , Gems, Sixth Edition (2006)

Sillimanite and Neptunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Neptunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Neptunite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.19-3.23 whereas that of Neptunite is 3.19-3.23.