Cordierite and Lapis lazuli Physical Properties

Cordierite

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.662.50-3.00

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

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

1.6 Cleavage

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

3,6

1.7 Mohs Hardness

7-7.55.5

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

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

Cordierite and Lapis lazuli Chemical Formula

While comparing Cordierite 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 Cordierite and Lapis lazuli chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
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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Cordierite and Lapis lazuli Specific Gravity

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