Willemite and Sapphire Physical Properties

Willemite

Sapphire

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.89-4.183.95-4.03

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

{0001}, {11 2 0} imperfect

None, but may exhibit parting

1.7 Mohs Hardness

5.59

2 10

1.8 Chemical Composition

Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Al ₂ O ₃

Willemite and Sapphire Chemical Formula

While comparing Willemite and Sapphire 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 Willemite and Sapphire chemical formula.

Chemical formula of Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Sapphire- Al ₂ O ₃

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Willemite and Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Willemite and Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Willemite and Sapphire Optical Properties during the identification of gemstone. Specific gravity of Willemite is 3.95-4.03 whereas that of Sapphire is 3.95-4.03.