Precious Opal and Boulder Opal Physical Properties

Precious Opal

Boulder 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

1.98-2.251.98-2.25

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references

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

1.6 Cleavage

Not Available

1.7 Mohs Hardness

5-6.55-6.5

2 10

1.8 Chemical Composition

SiO 2 · nH 2OGemdat.org , Management Team (2012)

SiO 2 + H 2OUlrich Henn and Claudio C.

Precious Opal and Boulder Opal Chemical Formula

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

Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Compare Blue Gemstones

Precious Opal Vs Sapphire

Precious Opal Vs Sardonyx

Precious Opal Vs Sard

Precious Opal and Boulder Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Precious Opal and Boulder Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Precious Opal and Boulder Opal Optical Properties during the identification of gemstone. Specific gravity of Precious Opal is 1.98-2.25 whereas that of Boulder Opal is 1.98-2.25.