Pyrophyllite and Petalite Physical Properties

Pyrophyllite

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.65-2.902.40

1 7.18

1.5 Fracture

Gemstones (2009), Flexible Flexible fragments.

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

{001} Perfect

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

Not Available6-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Pyrophyllite and Petalite Chemical Formula

While comparing Pyrophyllite and Petalite 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 Petalite chemical formula.

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

Compare Blue Gemstones

Pyrophyllite Vs Sardonyx

Pyrophyllite Vs Sard

Pyrophyllite Vs Scorzalite

Pyrophyllite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrophyllite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrophyllite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Pyrophyllite is 2.40 whereas that of Petalite is 2.40.