Crystal Opal and Goethite Physical Properties

Crystal 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

1.97-2.224.27-4.29

1 7.18

1.5 Fracture

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

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

5.5-6.55-5.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

FeO(OH)Arthur Thomas , Gemstones (2009)

Crystal Opal and Goethite Chemical Formula

While comparing Crystal 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 Crystal Opal and Goethite chemical formula.

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

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Crystal Opal Vs Diopside

Crystal Opal and Goethite Specific Gravity

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