Staurolite and Amethyst Physical Properties

Staurolite

Amethyst

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in common solvents

Durability

Specific Gravity

3.7-3.82.65

1 7.18

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Fracture

Subconchoidal, Conchoidal

Conchoidal, ConchoidalWalter Schumann

Cleavage

Distinct on {010}

Indiscernible

Mohs Hardness

7-7.57

2 10

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Chemical Composition

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

SiO₂

Staurolite and Amethyst Chemical Formula

While comparing Staurolite and Amethyst 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 Amethyst chemical formula.

Chemical formula of Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
Chemical formula of Amethyst- SiO₂

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Staurolite and Amethyst Specific Gravity

Another important criteria for qualitative analysis of gemstones is Staurolite and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Staurolite and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Staurolite is 2.65 whereas that of Amethyst is 2.65.