Pyrophyllite and Lazurite Physical Properties

Pyrophyllite

Lazurite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.65-2.902.75

1 7.18

1.5 Fracture

Gemstones (2009), Flexible Flexible fragments.

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

{001} Perfect

Imperfect on {110}

1.7 Mohs Hardness

Not Available5.5

2 10

1.8 Chemical Composition

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

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Pyrophyllite and Lazurite Chemical Formula

While comparing Pyrophyllite and Lazurite 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 Lazurite chemical formula.

Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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Pyrophyllite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrophyllite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrophyllite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Pyrophyllite is 2.75 whereas that of Lazurite is 2.75.