Achroite and Staurolite Physical Properties

Achroite

Staurolite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.90-3.403.7-3.8

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Subconchoidal, Conchoidal

Cleavage

Indiscernible

Distinct on {010}

Mohs Hardness

7-7.57-7.5

2 10

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Chemical Composition

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.

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

Achroite and Staurolite Chemical Formula

While comparing Achroite and Staurolite 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 Achroite and Staurolite chemical formula.

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

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Achroite and Staurolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Staurolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Staurolite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.7-3.8 whereas that of Staurolite is 3.7-3.8.