Emerald and Opal Physical Properties

Emerald

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

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)

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

1.6 Cleavage

Imperfect on the [0001]

None

1.7 Mohs Hardness

7.5-8

5-6.5

1.8 Chemical Composition

Be₃Al₂SiO₆

SiO₂ · nH₂O

Emerald and Opal Chemical Formula

While comparing Emerald and 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 Opal chemical formula.

Chemical formula of Emerald- Be₃Al₂SiO₆
Chemical formula of Opal- SiO₂ · nH₂O

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Emerald and Opal Specific Gravity

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