Opal and Cinnabar Physical Properties

Opal

Cinnabar

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1 Physical Properties

1.1 Tenacity

BrittleWalter Schumann

Slightly sectile

1.4 Solubility

hot salt water

1.04 x 10⁻²⁵ g per 100 ml water (Ksp at 25°C = 2 x 10⁻³²)

1.7 Durability

Not Available

1.9 Specific Gravity

1.98-2.252

1 7.18

1.17 Fracture

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

Uneven, Uneven, Gemstones (2009), Brittle

1.18 Cleavage

None

Prismatic {10 1 0}, perfect

1.19 Mohs Hardness

5-6.52-2.5

2 10

1.20 Chemical Composition

SiO₂ · nH₂O

HgSMichael OâDonoghue , 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.

Chemical formula of Opal- SiO₂ · nH₂O
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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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 and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Opal is 2 whereas that of Cinnabar is 2.