Agate Opal and Goethite Physical Properties

Agate 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

1.98-2.504.27-4.29

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001)

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 · nH 2OWalter Schumann , Gemstones of the world (2001)

FeO(OH)Arthur Thomas , Gemstones (2009)

Agate Opal and Goethite Chemical Formula

While comparing Agate 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 Agate Opal and Goethite chemical formula.

Chemical formula of Agate Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Agate Opal and Goethite Specific Gravity

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