Gahnite and Astrophyllite Physical Properties

Gahnite and Astrophyllite Chemical Formula

While comparing Gahnite and Astrophyllite 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 Gahnite and Astrophyllite chemical formula.

• Chemical formula of Gahnite- ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Gahnite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.