Apatite and Astrophyllite Physical Properties

Apatite and Astrophyllite Chemical Formula

While comparing Apatite 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 Apatite and Astrophyllite chemical formula.

• Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
• Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Apatite and Astrophyllite Specific Gravity

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