Gahnite and Common Opal Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.00-4.62
1.98-2.50
Fracture
Conchoidal, Uneven
Conchoidal, Conchoidal, Gemstones of the world (2001)
Cleavage
Indistinct parting on [111]
Not Available
Mohs Hardness
7.5-8
5.5-6.5
Chemical Composition
ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Gahnite and Common Opal Chemical Formula
While comparing Gahnite and Common Opal 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 Gahnite and Common Opal chemical formula.
- Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Gahnite and Common Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Gahnite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.