Onyx and Sodalite Physical Properties

Onyx

Sodalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.15-2.40

1 7.18

1.5 Fracture

Not Available

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

1.6 Cleavage

Indiscernible

Poor on {110}

1.7 Mohs Hardness

6.5-75-6

2 10

1.8 Chemical Composition

SiO₂

Na₈Al₆Si₆O₂₄Cl₂

Onyx and Sodalite Chemical Formula

While comparing Onyx and Sodalite 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 Sodalite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂

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Onyx and Sodalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Sodalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Sodalite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.15-2.40 whereas that of Sodalite is 2.15-2.40.