Astrophyllite and Neptunite Physical Properties

Astrophyllite and Neptunite Chemical Formula

While comparing Astrophyllite 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 Astrophyllite and Neptunite chemical formula.

• Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
• Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael O’Donoghue , Gems, Sixth Edition (2006)

Astrophyllite and Neptunite Specific Gravity

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