Precious Opal and Astrophyllite Physical Properties

Precious Opal and Astrophyllite Chemical Formula

While comparing Precious Opal 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 Precious Opal and Astrophyllite chemical formula.

• Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
• Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Precious Opal and Astrophyllite Specific Gravity

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