Cordierite and Pyrophyllite Physical Properties

Cordierite

Pyrophyllite

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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

2.57-2.662.65-2.90

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Gemstones (2009), Flexible Flexible fragments.

1.6 Cleavage

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

{001} Perfect

1.7 Mohs Hardness

7-7.5Not Available

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

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

Cordierite and Pyrophyllite Chemical Formula

While comparing Cordierite and Pyrophyllite 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 Pyrophyllite chemical formula.

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

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Cordierite and Pyrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Pyrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Pyrophyllite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.65-2.90 whereas that of Pyrophyllite is 2.65-2.90.