Forsterite and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.23-3.26
3.20-3.26
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Splintery
Cleavage
Perfect on {010} imperfect on {100}
{010} perfect
Mohs Hardness
6.5-7
6-7.5
Chemical Composition
Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Forsterite and Sillimanite Chemical Formula
While comparing Forsterite 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 Forsterite and Sillimanite chemical formula.
- Chemical formula of Forsterite- Mg 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Forsterite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Forsterite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Forsterite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Forsterite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.