Apatite and Polyhalite Physical Properties

Apatite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.232.78

1 7.18

1.5 Fracture

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

Conchoidal, Brittle

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Perfect on {10 1 }; parting on {010}

1.7 Mohs Hardness

53.5

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 Polyhalite Chemical Formula

While comparing Apatite and Polyhalite 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 Polyhalite 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 Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 2.78 whereas that of Polyhalite is 2.78.