Sodalite and Onyx Physical Properties

Sodalite

Onyx

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.15-2.402.55-2.70

1 7.18

1.5 Fracture

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

Not Available

1.6 Cleavage

Poor on {110}

Indiscernible

1.7 Mohs Hardness

5-66.5-7

2 10

1.8 Chemical Composition

Na₈Al₆Si₆O₂₄Cl₂

SiO₂

Sodalite and Onyx Chemical Formula

While comparing Sodalite and Onyx 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 Sodalite and Onyx chemical formula.

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

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Sodalite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sodalite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sodalite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Sodalite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.