Sillimanite and Esperite Physical Properties

Sillimanite and Esperite Chemical Formula

While comparing Sillimanite and Esperite 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 Esperite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Esperite- PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)

Sillimanite and Esperite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Esperite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Esperite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 4.28-4.42 whereas that of Esperite is 4.28-4.42.