Sillimanite and Ettringite Physical Properties
Tenacity
Tough
Not Available
Solubility
Not Available
Partially soluble in water
Durability
Not Available
Not Available
Specific Gravity
3.20-3.26
1.77
Fracture
Splintery
Not Available
Cleavage
{010} perfect
Perfect on {10 1 0}
Mohs Hardness
6-7.5
2-2.5
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Sillimanite and Ettringite Chemical Formula
While comparing Sillimanite and Ettringite 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 Ettringite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Sillimanite and Ettringite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 1.77 whereas that of Ettringite is 1.77.