Foitite and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.17
3.20-3.26
Fracture
Handbook of mineralogy (2001)
Splintery
Cleavage
None
{010} perfect
Chemical Composition
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Foitite and Sillimanite Chemical Formula
While comparing Foitite 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 Foitite and Sillimanite chemical formula.
- Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Foitite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Foitite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Foitite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Foitite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.