Sodalite and Sillimanite Physical Properties

Sodalite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.15-2.403.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

Splintery

1.6 Cleavage

Poor on {110}

{010} perfect

1.7 Mohs Hardness

5-66-7.5

2 10

1.8 Chemical Composition

Na₈Al₆Si₆O₂₄Cl₂

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Sodalite and Sillimanite Chemical Formula

While comparing Sodalite and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sodalite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sodalite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sodalite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Sodalite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.