Amethyst and Staurolite Physical Properties

Amethyst

Staurolite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in common solvents

Durability

Specific Gravity

2.653.7-3.8

1 7.18

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Fracture

Conchoidal, ConchoidalWalter Schumann

Subconchoidal, Conchoidal

Cleavage

Indiscernible

Distinct on {010}

Mohs Hardness

77-7.5

2 10

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Chemical Composition

SiO₂

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

Amethyst and Staurolite Chemical Formula

While comparing Amethyst 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 Amethyst and Staurolite chemical formula.

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

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Amethyst and Staurolite Specific Gravity

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