Apatite and Hercynite Physical Properties

Apatite

Hercynite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.234.39

1 7.18

1.5 Fracture

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

ConchoidalGemdat.org, Uneven

1.6 Cleavage

[0001] indistinct, [1010] indistinct

{111} Indistinct, {111} Indistinct, {111} Indistinct

1.7 Mohs Hardness

57.5-8

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

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Apatite and Hercynite Chemical Formula

While comparing Apatite and Hercynite 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 Hercynite 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 Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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Apatite and Hercynite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 4.39 whereas that of Hercynite is 4.39.