Lazurite and Cordierite Physical Properties

Lazurite

Cordierite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.75

2.57-2.66

1.5 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

Imperfect on {110}

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

1.7 Mohs Hardness

5.5

7-7.5

1.8 Chemical Composition

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Mg2Al4Si5O18

Lazurite and Cordierite Chemical Formula

While comparing Lazurite 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 Lazurite and Cordierite chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Chemical formula of Cordierite- Mg2Al4Si5O18

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Lazurite and Cordierite Specific Gravity

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