Biotite and Apatite Physical Properties

Biotite

Apatite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.7-3.33.16-3.23

1 7.18

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Fracture

Uneven, Even

Conchoidal, Uneven, Conchoidal to uneven

Cleavage

Perfect on the {001}

[0001] indistinct, [1010] indistinct

Mohs Hardness

2.5-3.05

2 10

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Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

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

Biotite and Apatite Chemical Formula

While comparing Biotite 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 Biotite and Apatite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
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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Biotite and Apatite Specific Gravity

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