Staurolite and Augelite Physical Properties

Staurolite

Augelite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.82.70-2.75

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal

Cleavage

Distinct on {010}

From the Greek for luster, for its pearly luster on the cleavage.

Mohs Hardness

7-7.54.5-5

2 10

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Chemical Composition

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

Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)

Staurolite and Augelite Chemical Formula

While comparing Staurolite and Augelite 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 Augelite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Augelite- Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Brown Gemstones

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Staurolite Vs Mottramite

Staurolite and Augelite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Augelite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Augelite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.70-2.75 whereas that of Augelite is 2.70-2.75.