Alexandrite and Precious Opal Physical Properties

Alexandrite

Precious 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

3.69-3.811.98-2.25

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

1,1 ; 3,2.

Not Available

1.7 Mohs Hardness

8.55-6.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

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

Alexandrite and Precious Opal Chemical Formula

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

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)

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Alexandrite and Precious Opal Specific Gravity

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