Apatite and Cordierite Physical Properties

Apatite

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.23

2.57-2.66

1.5 Fracture

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

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Fair on {100}, poor on {001} and {010}

1.7 Mohs Hardness

7-7.5

1.8 Chemical Composition

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

Mg2Al4Si5O18

Apatite and Cordierite Chemical Formula

While comparing Apatite and Cordierite 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 Apatite and Cordierite chemical formula.

Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Cordierite- Mg2Al4Si5O18

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Apatite and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.