Apatite and Atacamite Physical Properties

Apatite

Atacamite

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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

3.16-3.233.745-3.776

1 7.18

1.5 Fracture

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

Conchoidal, Conchoidal, Brittle

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Perfect on {010}, fair on {101}

1.7 Mohs Hardness

53-3.5

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

Cu2Cl(OH)3

Apatite and Atacamite Chemical Formula

While comparing Apatite and Atacamite 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 Atacamite 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 Atacamite- Cu2Cl(OH)3

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Apatite and Atacamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.