Povondraite and Sillimanite Physical Properties

Povondraite and Sillimanite Chemical Formula

While comparing Povondraite and Sillimanite 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 Povondraite and Sillimanite chemical formula.

• Chemical formula of Povondraite- NaFe3+3Fe3+6(BO 3) 3Si 6O 18(O,OH) 4Anthony et al , Handbook of Mineralogy (2001)
• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Povondraite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Povondraite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Povondraite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Povondraite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.