Pearl and Common Opal Physical Properties

Pearl

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

2.60-2.85

1.98-2.50

1.5 Fracture

Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

none

Not Available

1.7 Mohs Hardness

2.5-4.5

5.5-6.5

1.8 Chemical Composition

Not Available

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

Pearl and Common Opal Chemical Formula

While comparing Pearl 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 Pearl and Common Opal chemical formula.

Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Pearl and Common Opal Specific Gravity

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