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Cordierite
Cordierite

Alunite
Alunite



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Cordierite
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Alunite

Cordierite and Alunite Physical Properties

1 Physical Properties
1.1 Tenacity
Brittle
Brittle
1.2 Solubility
Not Available
Soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.57-2.662.6-2.9
Amber
1 7.18
1.5 Fracture
Subconchoidal, Conchoidal, Brittle
Conchoidal, Uneven
1.6 Cleavage
Fair on {100}, poor on {001} and {010}
On {0001}, perfect
1.7 Mohs Hardness
7-7.53.5-4
Amber
2 10
1.8 Chemical Composition
Mg2Al4Si5O18
KAl3(SO4)2(OH)6

Cordierite and Alunite Chemical Formula

While comparing Cordierite and Alunite 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 Cordierite and Alunite chemical formula.

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

Cordierite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.