Goethite and Achroite Physical Properties

Goethite

Achroite

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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

4.27-4.292.90-3.40

1 7.18

1.5 Fracture

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

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Perfect {010}

Not Available

1.7 Mohs Hardness

5-5.57-7.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Goethite and Achroite Chemical Formula

While comparing Goethite and Achroite 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 Achroite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Goethite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.