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Onyx
Onyx

Cordierite
Cordierite



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Onyx
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Cordierite

Onyx and Cordierite Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.55-2.70
2.57-2.66
1.5 Fracture
Not Available
Subconchoidal, Conchoidal, Brittle
1.6 Cleavage
Indiscernible
Fair on {100}, poor on {001} and {010}
1.7 Mohs Hardness
6.5-7
7-7.5
1.8 Chemical Composition
SiO2
Mg2Al4Si5O18

Onyx and Cordierite Chemical Formula

While comparing Onyx 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 Onyx and Cordierite chemical formula.

  • Chemical formula of Onyx- SiO2
  • Chemical formula of Cordierite- Mg2Al4Si5O18

Onyx and Cordierite Specific Gravity

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