Pyrophyllite and Cordierite Physical Properties

Pyrophyllite

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

2.65-2.902.57-2.66

1 7.18

1.5 Fracture

Gemstones (2009), Flexible Flexible fragments.

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

{001} Perfect

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

1.7 Mohs Hardness

Not Available7-7.5

2 10

1.8 Chemical Composition

Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Mg2Al4Si5O18

Pyrophyllite and Cordierite Chemical Formula

While comparing Pyrophyllite 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 Pyrophyllite and Cordierite chemical formula.

Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Cordierite- Mg2Al4Si5O18

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Pyrophyllite and Cordierite Specific Gravity

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