Goethite and Aragonite Physical Properties

Goethite

Aragonite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

HCl soluble

Dilute acid

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.93-2.96

1 7.18

1.5 Fracture

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

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Perfect {010}

Distinct on {010}, imperfect {110} and {011}

1.7 Mohs Hardness

5-5.53.5-4

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Goethite and Aragonite Chemical Formula

While comparing Goethite and Aragonite 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 Aragonite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Goethite and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.