Sillimanite and Tourmaline Physical Properties

Sillimanite and Tourmaline Chemical Formula

While comparing Sillimanite and Tourmaline 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 Tourmaline chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

Sillimanite and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.