Petalite and Lazurite Physical Properties

Petalite

Lazurite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

insoluble

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.40

2.75

1.5 Fracture

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

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

1.6 Cleavage

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

Imperfect on {110}

1.7 Mohs Hardness

6-6.5

5.5

1.8 Chemical Composition

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

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

Petalite and Lazurite Chemical Formula

While comparing Petalite 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 Petalite and Lazurite chemical formula.

Chemical formula of Petalite- LiAlSi 4O 10Michael 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.

Compare Gems Found In Australia

Petalite Vs Scheelite

Petalite Vs Sapphire

Petalite Vs Scolecite

Petalite and Lazurite Specific Gravity

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