Staurolite and Malachite Physical Properties

Staurolite

Malachite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.7-3.83.25-4.10

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal, Uneven

Cleavage

Distinct on {010}

Perfect on { 2 01} fair on {010}

Mohs Hardness

7-7.53.5-4

2 10

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Chemical Composition

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

Cu₂CO₃(OH)₂

Staurolite and Malachite Chemical Formula

While comparing Staurolite and Malachite 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 Malachite chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Malachite- Cu₂CO₃(OH)₂

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Staurolite and Malachite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Malachite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Malachite Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 3.25-4.10 whereas that of Malachite is 3.25-4.10.