Opal and Apatite Physical Properties

Opal

Apatite

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1 Physical Properties

1.1 Tenacity

BrittleWalter Schumann

Not Available

1.2 Solubility

hot salt water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.253.16-3.23

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

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

1.6 Cleavage

None

[0001] indistinct, [1010] indistinct

1.7 Mohs Hardness

5-6.55

2 10

1.8 Chemical Composition

SiO₂ · nH₂O

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

Opal and Apatite Chemical Formula

While comparing Opal 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 Opal and Apatite chemical formula.

Chemical formula of Opal- SiO₂ · nH₂O
Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Compare Semi Precious Gemstones

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Opal Vs Alexandrite

Opal Vs Amethyst

Opal and Apatite Specific Gravity

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