Precious Opal and Hercynite Physical Properties

Precious 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

1.98-2.254.39

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references

ConchoidalGemdat.org, Uneven

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

5-6.57.5-8

2 10

1.8 Chemical Composition

SiO 2 · nH 2OGemdat.org , Management Team (2012)

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

Precious Opal and Hercynite Chemical Formula

While comparing Precious 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 Precious Opal and Hercynite chemical formula.

Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Compare Blue Gemstones

Precious Opal Vs Sapphire

Precious Opal Vs Sard

Precious Opal Vs Sardonyx

Precious Opal and Hercynite Specific Gravity

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