Corundum and Pyrophyllite Physical Properties

Corundum

Pyrophyllite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.65-2.90

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Gemstones (2009), Flexible Flexible fragments.

1.6 Cleavage

None – parting in 3 directions

{001} Perfect

1.7 Mohs Hardness

9Not Available

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

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

Corundum and Pyrophyllite Chemical Formula

While comparing Corundum 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 Corundum and Pyrophyllite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Corundum and Pyrophyllite Specific Gravity

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