Sapphire and Petalite Physical Properties

Sapphire

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.032.40

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

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

1.6 Cleavage

None, but may exhibit parting

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

1.7 Mohs Hardness

96-6.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

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

Sapphire and Petalite Chemical Formula

While comparing Sapphire 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 Sapphire and Petalite chemical formula.

Chemical formula of Sapphire- Al ₂ O ₃
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sapphire and Petalite Specific Gravity

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