Hercynite and Black Opal Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.39
1.97-2.22
Fracture
ConchoidalGemdat.org, Uneven
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Not Available
Mohs Hardness
7.5-8
6-6.5
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
SiO 2 + H 2OUlrich Henn and Claudio C.
Hercynite and Black Opal Chemical Formula
While comparing Hercynite and Black 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 Black Opal chemical formula.
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Hercynite and Black Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hercynite and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.