Boulder Opal and Common Opal Physical Properties

Boulder Opal

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

1.98-2.251.98-2.50

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

Not Available

1.7 Mohs Hardness

5-6.55.5-6.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

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

Boulder Opal and Common Opal Chemical Formula

While comparing Boulder Opal 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 Boulder Opal and Common Opal chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Compare Blue Gemstones

Boulder Opal Vs Chrome-Chalcedony

Boulder Opal Vs Chrysocolla

Boulder Opal Vs Chrome Tourmaline

Boulder Opal and Common Opal Specific Gravity

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