Staurolite and Iolite Physical Properties

Staurolite

Iolite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.7-3.82.6-2.7

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Not Available

1.6 Cleavage

Distinct on {010}

3,1

1.7 Mohs Hardness

7-7.57-7.5

2 10

1.8 Chemical Composition

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

Mg₂Al₄Si₅O₁₈

Staurolite and Iolite Chemical Formula

While comparing Staurolite and Iolite 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 Iolite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈

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Staurolite and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Iolite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.6-2.7 whereas that of Iolite is 2.6-2.7.