Hercynite and Opal Physical Properties
Tenacity
Not Available
BrittleWalter Schumann
Solubility
Not Available
hot salt water
Durability
Not Available
Not Available
Specific Gravity
4.39
1.98-2.25
Fracture
ConchoidalGemdat.org, Uneven
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None
Mohs Hardness
7.5-8
5-6.5
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
SiO2 · nH2O
Hercynite and Opal Chemical Formula
While comparing Hercynite and 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 Opal chemical formula.
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
- Chemical formula of Opal- SiO2 · nH2O
Hercynite and Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hercynite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Opal Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 1.98-2.25 whereas that of Opal is 1.98-2.25.