Brookite and Pyrophyllite Physical Properties

Brookite

Pyrophyllite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.87-4.142.65-2.90

1 7.18

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Fracture

Subconchoidal, Conchoidal

Cleavage

Poor on {120}, in traces on {001}

{001} Perfect

Mohs Hardness

5.5-6-9999

2 10

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Chemical Composition

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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

Brookite and Pyrophyllite Chemical Formula

While comparing Brookite 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 Brookite and Pyrophyllite chemical formula.

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

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Brookite and Pyrophyllite Specific Gravity

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