Apatite and Willemite Physical Properties

Apatite

Willemite

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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

3.16-3.233.89-4.18

1 7.18

1.5 Fracture

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

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

1.6 Cleavage

[0001] indistinct, [1010] indistinct

{0001}, {11 2 0} imperfect

1.7 Mohs Hardness

55.5

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

Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Apatite and Willemite Chemical Formula

While comparing Apatite and Willemite 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 Willemite 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 Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Apatite and Willemite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Willemite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Willemite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 3.89-4.18 whereas that of Willemite is 3.89-4.18.