Goethite and Precious Opal Physical Properties

Goethite

Precious Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

HCl soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.291.98-2.25

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}

Not Available

1.7 Mohs Hardness

5-5.55-6.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

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

Goethite and Precious Opal Chemical Formula

While comparing Goethite and Precious 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 Goethite and Precious Opal chemical formula.

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

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Goethite and Precious Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Precious Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Precious Opal Optical Properties during the identification of gemstone. Specific gravity of Goethite is 1.98-2.25 whereas that of Precious Opal is 1.98-2.25.