Ettringite and Apatite Physical Properties

Ettringite

Apatite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

Partially soluble in water

1.77

Perfect on {10 1 0}

2-2.5

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

3.16-3.23

Conchoidal, Uneven, Conchoidal to uneven

[0001] indistinct, [1010] indistinct

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

Ettringite and Apatite Chemical Formula

While comparing Ettringite 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 Ettringite and Apatite chemical formula.

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Ettringite and Apatite Specific Gravity

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