Hercynite and Common Opal Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.39
1.98-2.50
Fracture
ConchoidalGemdat.org, Uneven
Conchoidal, Conchoidal, Gemstones of the world (2001)
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Not Available
Mohs Hardness
7.5-8
5.5-6.5
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Hercynite and Common Opal Chemical Formula
While comparing Hercynite 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 Hercynite and Common Opal chemical formula.
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Hercynite and Common Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hercynite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.