Apatite and Kyanite Physical Properties

Apatite

Kyanite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.233.53-3.65

1 7.18

1.5 Fracture

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

Splintery, Brittle, Metallic

1.6 Cleavage

[0001] indistinct, [1010] indistinct

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

1.7 Mohs Hardness

54-7

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

Not Available

Apatite and Kyanite Chemical Formula

While comparing Apatite and Kyanite 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 Kyanite 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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Apatite and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.