Andalusite and Goethite Physical Properties

Andalusite

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

3.05-3.21

4.27-4.29

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Good on {110}, poor on {100}

Perfect {010}

1.7 Mohs Hardness

7.5

5-5.5

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

FeO(OH)Arthur Thomas , Gemstones (2009)

Andalusite and Goethite Chemical Formula

While comparing Andalusite 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 Andalusite and Goethite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Andalusite and Goethite Specific Gravity

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