Goethite and Crystal Opal Physical Properties

Goethite

Crystal 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

4.27-4.29

1.97-2.22

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}

Not Available

1.7 Mohs Hardness

5-5.5

5.5-6.5

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

SiO 2 + H 2OUlrich Henn and Claudio C.

Goethite and Crystal Opal Chemical Formula

While comparing Goethite and Crystal 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 Crystal Opal chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Goethite and Crystal Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Crystal Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Crystal Opal Optical Properties during the identification of gemstone. Specific gravity of Goethite is 1.97-2.22 whereas that of Crystal Opal is 1.97-2.22.