Staurolite and Thulite Physical Properties

Staurolite

Thulite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.83.1

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven, Conchoidal

Cleavage

Distinct on {010}

Perfect {010} imperfect {100}

Mohs Hardness

7-7.56-7

2 10

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Chemical Composition

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

Ca₂Al₃(SiO₄)₃(OH)

Staurolite and Thulite Chemical Formula

While comparing Staurolite and Thulite 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 Thulite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Thulite- Ca₂Al₃(SiO₄)₃(OH)

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Staurolite and Thulite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Thulite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Thulite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.1 whereas that of Thulite is 3.1.