Crystal Opal and Sillimanite Physical Properties
Tenacity
Not Available
Tough
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.97-2.22
3.20-3.26
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Splintery
Cleavage
Not Available
{010} perfect
Mohs Hardness
5.5-6.5
6-7.5
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Crystal Opal and Sillimanite Chemical Formula
While comparing Crystal Opal 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 Crystal Opal and Sillimanite chemical formula.
- Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Crystal Opal and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Crystal Opal and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Crystal Opal and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Crystal Opal is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.