Apatite and Corundum Physical Properties

Apatite

Corundum

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.233.90-4.05

1 7.18

1.5 Fracture

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

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

[0001] indistinct, [1010] indistinct

None – parting in 3 directions

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

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

Al 2O 3Arthur Thomas , Gemstones (2009)

Apatite and Corundum Chemical Formula

While comparing Apatite and Corundum 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 Corundum 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 Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

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Apatite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Apatite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.