Willemite and Common Opal Physical Properties

Willemite

Common Opal

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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

3.89-4.181.98-2.50

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

{0001}, {11 2 0} imperfect

Not Available

1.7 Mohs Hardness

5.55.5-6.5

2 10

1.8 Chemical Composition

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

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Willemite and Common Opal Chemical Formula

While comparing Willemite and Common Opal 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 Common Opal chemical formula.

Chemical formula of Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Willemite and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Willemite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Willemite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Willemite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.