Sodalite and Lapis lazuli Physical Properties

Sodalite

Lapis lazuli

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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

2.15-2.402.50-3.00

1 7.18

1.5 Fracture

Conchoidal, Uneven, UnevenArthur Thomas, Brittle

Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Poor on {110}

3,6

1.7 Mohs Hardness

5-65.5

2 10

1.8 Chemical Composition

Na₈Al₆Si₆O₂₄Cl₂

The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

Sodalite and Lapis lazuli Chemical Formula

While comparing Sodalite and Lapis lazuli 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 Lapis lazuli chemical formula.

Chemical formula of Sodalite- Na₈Al₆Si₆O₂₄Cl₂
Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

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Sodalite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sodalite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sodalite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Sodalite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.