Polyhalite and Apatite Physical Properties

Polyhalite

Apatite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.78

3.16-3.23

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

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

[0001] indistinct, [1010] indistinct

1.7 Mohs Hardness

3.5

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

Polyhalite and Apatite Chemical Formula

While comparing Polyhalite 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 Polyhalite 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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Polyhalite Vs Vanadinite

Polyhalite Vs Heliotrope

Polyhalite Vs Jacinth

Polyhalite and Apatite Specific Gravity

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