Precious Opal and Goethite Physical Properties

Precious Opal

Goethite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.254.27-4.29

1 7.18

1.5 Fracture

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

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

1.6 Cleavage

Not Available

Perfect {010}

1.7 Mohs Hardness

5-6.55-5.5

2 10

1.8 Chemical Composition

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

FeO(OH)Arthur Thomas , Gemstones (2009)

Precious Opal and Goethite Chemical Formula

While comparing Precious Opal and Goethite 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 Goethite chemical formula.

Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

Compare Blue Gemstones

Precious Opal Vs Sard

Precious Opal Vs Sardonyx

Precious Opal Vs Sapphire

Precious Opal and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Precious Opal and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Precious Opal and Goethite Optical Properties during the identification of gemstone. Specific gravity of Precious Opal is 4.27-4.29 whereas that of Goethite is 4.27-4.29.