Emerald and Boulder Opal Physical Properties

Emerald

Boulder Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Hard

Not Available

1.4 Specific Gravity

2.67-2.78

1.98-2.25

1.5 Fracture

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

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

1.6 Cleavage

Imperfect on the [0001]

Not Available

1.7 Mohs Hardness

7.5-8

5-6.5

1.8 Chemical Composition

Be₃Al₂SiO₆

SiO 2 + H 2OUlrich Henn and Claudio C.

Emerald and Boulder Opal Chemical Formula

While comparing Emerald 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 Emerald and Boulder Opal chemical formula.

Chemical formula of Emerald- Be₃Al₂SiO₆
Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Emerald and Boulder Opal Specific Gravity

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