Apatite and Ettringite Physical Properties

Apatite

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.16-3.23

1.77

1.5 Fracture

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

Not Available

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Perfect on {10 1 0}

1.7 Mohs Hardness

2-2.5

1.8 Chemical Composition

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

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Apatite and Ettringite Chemical Formula

While comparing Apatite and Ettringite 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 Ettringite 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 Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Apatite and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 1.77 whereas that of Ettringite is 1.77.