Common Opal and Fayalite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.50
4.392
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Cleavage
Not Available
{010} moderate, {100} imperfect
Mohs Hardness
5.5-6.5
6.5-7
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Common Opal and Fayalite Chemical Formula
While comparing Common Opal and Fayalite 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 Common Opal and Fayalite chemical formula.
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Common Opal and Fayalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Common Opal and Fayalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Fayalite Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 4.392 whereas that of Fayalite is 4.392.