Black Opal and Hercynite Physical Properties

Black Opal

Hercynite

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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

1.97-2.224.39

1 7.18

1.5 Fracture

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

ConchoidalGemdat.org, Uneven

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

6-6.57.5-8

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Black Opal and Hercynite Chemical Formula

While comparing Black Opal and Hercynite 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 Black Opal and Hercynite chemical formula.

Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Compare Blue Gemstones

Black Opal Vs Brucite

Black Opal Vs Caledonite

Black Opal Vs Boulder Opal

Black Opal and Hercynite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 4.39 whereas that of Hercynite is 4.39.