Pyrophyllite and Goethite Physical Properties

Pyrophyllite

Goethite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.65-2.904.27-4.29

1 7.18

1.5 Fracture

Gemstones (2009), Flexible Flexible fragments.

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

1.6 Cleavage

{001} Perfect

Perfect {010}

1.7 Mohs Hardness

Not Available5-5.5

2 10

1.8 Chemical Composition

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

FeO(OH)Arthur Thomas , Gemstones (2009)

Pyrophyllite and Goethite Chemical Formula

While comparing Pyrophyllite and Goethite 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 Goethite chemical formula.

Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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Pyrophyllite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrophyllite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrophyllite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Pyrophyllite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.