Apatite and Nepheline Physical Properties

Apatite

Nepheline

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.232.55-2.65

1 7.18

1.5 Fracture

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

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

[0001] indistinct, [1010] indistinct

[1010] Poor

1.7 Mohs Hardness

55-6

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

Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.

Apatite and Nepheline Chemical Formula

While comparing Apatite and Nepheline 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 Nepheline 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
Chemical formula of Nepheline- Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.

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Apatite and Nepheline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Nepheline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Nepheline Optical Properties during the identification of gemstone. Specific gravity of Apatite is 2.55-2.65 whereas that of Nepheline is 2.55-2.65.