Pyrophyllite and Lapis lazuli Physical Properties

Pyrophyllite

Lapis lazuli

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.65-2.902.50-3.00

1 7.18

1.5 Fracture

Gemstones (2009), Flexible Flexible fragments.

Uneven-Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

{001} Perfect

3,6

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

The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

Pyrophyllite and Lapis lazuli Chemical Formula

While comparing Pyrophyllite and Lapis lazuli 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 Lapis lazuli chemical formula.

Chemical formula of Pyrophyllite- Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

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Pyrophyllite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrophyllite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrophyllite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Pyrophyllite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.