Alunite and Cordierite Physical Properties

Alunite

Cordierite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.92.57-2.66

1 7.18

1.5 Fracture

Conchoidal, Uneven

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

On {0001}, perfect

Fair on {100}, poor on {001} and {010}

1.7 Mohs Hardness

3.5-47-7.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Mg2Al4Si5O18

Alunite and Cordierite Chemical Formula

While comparing Alunite and Cordierite 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 Alunite and Cordierite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Cordierite- Mg2Al4Si5O18

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Alunite and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.