Goethite and Andalusite Physical Properties

Goethite

Andalusite

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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

4.27-4.293.05-3.21

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Perfect {010}

Good on {110}, poor on {100}

1.7 Mohs Hardness

5-5.57.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

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

Goethite and Andalusite Chemical Formula

While comparing Goethite and Andalusite 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 Andalusite chemical formula.

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

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Goethite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.