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Opal
Opal

Cinnabar
Cinnabar



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Opal
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Opal and Cinnabar Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O
 
Slightly sectile
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
-
2
Uneven
Prismatic {10 1 0}, perfect
2-2.5
HgSMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Opal and Cinnabar Chemical Formula

While comparing Opal and Cinnabar 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 Opal and Cinnabar chemical formula.

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Opal and Cinnabar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Opal and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal Vs Cinnabar during the identification of gemstone. Specific gravity of Opal is whereas that of Cinnabar is .