Spinel and Apatite Physical Properties

Spinel

Apatite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.64-3.663.16-3.23

1 7.18

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Fracture

Conchoidal, Uneven

Conchoidal, Uneven, Conchoidal to uneven

Cleavage

None, but may exhibit slight parting

[0001] indistinct, [1010] indistinct

Mohs Hardness

2 10

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Chemical Composition

MgAl₂O₄

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

Spinel and Apatite Chemical Formula

While comparing Spinel 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 Spinel and Apatite chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

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Spinel and Apatite Specific Gravity

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