Lapis lazuli and Cordierite Physical Properties

Lapis lazuli

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.50-3.002.57-2.66

1 7.18

1.5 Fracture

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

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

3,6

Fair on {100}, poor on {001} and {010}

1.7 Mohs Hardness

5.57-7.5

2 10

1.8 Chemical Composition

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

Mg2Al4Si5O18

Lapis lazuli and Cordierite Chemical Formula

While comparing Lapis lazuli and Cordierite 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 Lapis lazuli and Cordierite chemical formula.

Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄
Chemical formula of Cordierite- Mg2Al4Si5O18

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Lapis lazuli and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Lapis lazuli and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lapis lazuli and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Lapis lazuli is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.