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Cordierite
Cordierite

Kyanite
Kyanite



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Cordierite
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Kyanite

Cordierite and Kyanite Physical Properties

1 Physical Properties
1.1 Tenacity
Brittle
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.57-2.66
3.53-3.65
1.5 Fracture
Subconchoidal, Conchoidal, Brittle
Splintery, Brittle, Metallic
1.6 Cleavage
Fair on {100}, poor on {001} and {010}
[100] perfect [010] imperfect with 79° angle between
1.7 Mohs Hardness
7-7.5
4-7
1.8 Chemical Composition
Mg2Al4Si5O18
Not Available

Cordierite and Kyanite Chemical Formula

While comparing Cordierite and Kyanite 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 Kyanite chemical formula.

  • Chemical formula of Cordierite- Mg2Al4Si5O18
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Cordierite and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.