Adamite and Goethite Physical Properties

Adamite

Goethite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.32-4.48

4.27-4.29

1.5 Fracture

Uneven, Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven, Subconchoidal, Brittle, Metallic, Brittle, Metallic

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

1.6 Cleavage

{101}, good; {010}, poor

Perfect {010}

1.7 Mohs Hardness

3.5

5-5.5

1.8 Chemical Composition

Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)

FeO(OH)Arthur Thomas , Gemstones (2009)

Adamite and Goethite Chemical Formula

While comparing Adamite 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 Adamite and Goethite chemical formula.

Chemical formula of Adamite- Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Adamite and Goethite Specific Gravity

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