Sillimanite and Pyrophyllite Physical Properties

Sillimanite and Pyrophyllite Chemical Formula

While comparing Sillimanite and Pyrophyllite 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 Pyrophyllite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Sillimanite and Pyrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.