Kyanite and Apatite Physical Properties

Kyanite

Apatite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.653.16-3.23

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

[0001] indistinct, [1010] indistinct

1.7 Mohs Hardness

4-75

2 10

1.8 Chemical Composition

Not Available

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

Kyanite and Apatite Chemical Formula

While comparing Kyanite 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 Kyanite and Apatite 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

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Kyanite and Apatite Specific Gravity

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