Goethite and Apatite Physical Properties

Goethite

Apatite

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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

4.27-4.29

3.16-3.23

1.5 Fracture

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

Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal to uneven

1.6 Cleavage

Perfect {010}

[0001] indistinct, [1010] indistinct

1.7 Mohs Hardness

5-5.5

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Goethite and Apatite Chemical Formula

While comparing Goethite and Apatite 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 Apatite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

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Goethite and Apatite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Apatite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 3.16-3.23 whereas that of Apatite is 3.16-3.23.