Staurolite and Achroite Physical Properties

Staurolite

Achroite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.82.90-3.40

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven, ConchoidalWalter Schumann

Cleavage

Distinct on {010}

Indiscernible

Mohs Hardness

7-7.57-7.5

2 10

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Chemical Composition

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

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Staurolite and Achroite Chemical Formula

While comparing Staurolite and Achroite 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 Achroite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Staurolite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.