Hercynite and Black Opal Physical Properties

Hercynite

Black Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.391.97-2.22

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Uneven

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{111} Indistinct, {111} Indistinct, {111} Indistinct

Not Available

1.7 Mohs Hardness

7.5-86-6.5

2 10

1.8 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.

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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.