Willemite and Cordierite Physical Properties

Willemite

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

3.89-4.182.57-2.66

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

{0001}, {11 2 0} imperfect

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

1.7 Mohs Hardness

5.57-7.5

2 10

1.8 Chemical Composition

Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Mg2Al4Si5O18

Willemite and Cordierite Chemical Formula

While comparing Willemite 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 Willemite and Cordierite chemical formula.

Chemical formula of Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Cordierite- Mg2Al4Si5O18

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Willemite and Cordierite Specific Gravity

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