Cordierite and Legrandite Physical Properties

Cordierite

Legrandite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.663.98-4.04

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

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

Imperfect, poor one {100}

1.7 Mohs Hardness

7-7.54.5-5

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Cordierite and Legrandite Chemical Formula

While comparing Cordierite and Legrandite 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 Legrandite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Legrandite- Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Cordierite and Legrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Legrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Legrandite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.98-4.04 whereas that of Legrandite is 3.98-4.04.