Staurolite and Apatite Physical Properties

Staurolite

Apatite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.83.16-3.23

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal, Uneven, Conchoidal to uneven

Cleavage

Distinct on {010}

[0001] indistinct, [1010] indistinct

Mohs Hardness

7-7.55

2 10

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Chemical Composition

(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

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

Staurolite and Apatite Chemical Formula

While comparing Staurolite 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 Staurolite and Apatite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
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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Staurolite and Apatite Specific Gravity

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