Apatite and Austinite Physical Properties

Apatite

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.23

4.12

1.5 Fracture

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

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Good in two directions parallel to the prism faces {110}

1.7 Mohs Hardness

4-4.5

1.8 Chemical Composition

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

CaZn(AsO4)(OH)

Apatite and Austinite Chemical Formula

While comparing Apatite and Austinite 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 Austinite 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 Austinite- CaZn(AsO4)(OH)

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Apatite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 4.12 whereas that of Austinite is 4.12.