Sillimanite and Scapolite Physical Properties

Sillimanite and Scapolite Chemical Formula

While comparing Sillimanite and Scapolite 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 Scapolite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Scapolite- Na 4Al 3Si 9O 24Cl to Ca 4Al 6Si 6O 24(CO 3,SO 4)Walter Schumann , Gemstones of the world (2001) More from other references

Sillimanite and Scapolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Scapolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Scapolite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.58-2.74 whereas that of Scapolite is 2.58-2.74.