Onyx and Iolite Physical Properties

Onyx

Iolite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.70

2.6-2.7

1.5 Fracture

Not Available

1.6 Cleavage

Indiscernible

3,1

1.7 Mohs Hardness

6.5-7

7-7.5

1.8 Chemical Composition

SiO₂

Mg₂Al₄Si₅O₁₈

Onyx and Iolite Chemical Formula

While comparing Onyx and Iolite 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 Iolite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈

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Onyx and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Iolite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.6-2.7 whereas that of Iolite is 2.6-2.7.