Onyx and Cordierite Physical Properties

Onyx

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.57-2.66

1 7.18

1.5 Fracture

Not Available

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

Indiscernible

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

1.7 Mohs Hardness

6.5-77-7.5

2 10

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

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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.